Quote from jimrockford:
Let me first explain it with cash-settled options, and then with physically settled options.
If you are trading a spread on American style, cash-settled options, then you face the following risk of extreme uncontrolled loss:
A strong market move puts the spread deep in the money at the close of trading. The short option leg is exercised, generating a huge loss. You take comfort in your long option leg, which will limit that loss, with profit left over to spare. It is, however, too late to exercise your long option leg on the same day, because you didn't receive notice of assignment on the short leg until after it was already too late for you to issue early exercise instructions (note this will always be the case). So you resolve to exercise the long option leg as soon as possible, which would be the following trading day. So you are perfectly safe, right? Wrong.
You wake up and learn that the market has gapped open violently in the opposite direction from yesterday's big move. It keeps going and never looks back. Your long option leg becomes worthless by the close. You issue exercise instructions, but you get no cash because your long option leg is now worthless. You are now stuck with the entire loss generated by the short leg.
But there is another thing that can go wrong. Suppose the loss generated by the short leg so severely reduces your account equity, that you are in violation of margin rules. The long option leg counterbalanced this loss by becoming extremely valuable, but because it is an option, its value DOES NOT count toward measuring your account equity or satisfying your margin obligations. The broker now has the right to liquidate your long option leg by selling it before you have a chance to exercise it. The broker wishes to do this in order to generate some cash, which would count toward your account equity and reduce your margin obligations. What if there is no reasonable bid at the time of sale? What if the bid is near zero? This scenario also sticks you with most or all of the loss generated by the short leg.
Here is another nightmare scenario, which applies to physically settled, American style options. You have incurred a massive loss on the short option leg, and you have been stuck with a long or short equity position by assignment of your short option leg, and you resolve to exercise your long option leg in 24 hours, so as to reverse your massive loss. But - oh no! This massive loss triggers a margin violation! Your long option leg is extremely valuable, but because it is an option, its value does not count toward measuring your account equity or satisfying your margin obligations. So, the broker has the right to liquidate your account, and your long option leg is sold at an unreasonably low price before you get a chance to exercise it, and once again, you are stuck with most or all of the loss generated by the short option leg.
A variation on that nightmare scenario might occur where your long option leg is not liquidated, but the long or short equity position resulting from your short leg's assignment is liquidated instead, because you don't have enough margin to carry that equity position. You are confident you will be OK, though, because you plan to exercise your long option leg in 24 hours. But oh no! By the time you get the proceeds from exercising your long option leg, they have dwindled to near zero, because the market moved hard and fast against your long option leg! And once again, you are stuck with most or all of the massive loss generated by the short option leg!
Here is another variation on that nightmare scenario, which can occur when you are using options in order to get a great deal of leverage, to benefit from price movements on notional underlying quantities so large you could never afford to swing them around as underlyings. Your long or short equity position is liquidated, but your long option leg is left intact, and the market does NOT move against your long leg before you can exercise it. This successful exercise results in a new long or short equity position. You resolve to play it safe by closing that equity position at tomorrow morning's open. But oh no! The market gaps hard and far against you, and because you were excessively leveraged, the gap wipes out your entire account!
Your worries apply only to spreads in American style cash settled, which the only viable contract of this type would be the OEX contract. The vast majority of cash settled options are European style index options (which are the only spreads allowed in cash accounts, and you know you can't rant against those anyway)
Debit put spreads in American style physical options, which are the vast majority of options available for equities (like the OP's SPY puts in question), are shielded from adverse price moves after early assignment, because the short option writer is given a long stock position at the given strike price during the night after assignment, and can close the position the next day without enough cash to bear the position, without breaking margin rules, as you've been corrected earlier by johnnyc.
If I get assigned on the short put of my bear put spread for an American physical, I get forced long at the strike price of that short put. If the market gaps up drastically the next day to make my long put OTM and un-exercisable, I'm still long the market at the lower strike price and obviously make money and can close the position at a profit maybe even higher than anticipated from the spread. If it gaps up but not through my long put, leaving it ITM, I can exercise the long put to flatten my account for the expected maximum profit of the spread. If after early assignment, the market keeps tanking, I'm forced long at the short strike price without violating any margin requirements, but the next day I can still exercise the long put which would be DITM to flatten the long position in the account, which causes the maximum profit on the spread.
In all three possible scenarios after early assignment outlined above, you make money.
Assignment is a GOOD thing for debit spreads in equity options.
You need to trade these before you make long winded rants about them.