I'm the first to agree that you could be over-leveraged if you can't take delivery of options, but there are a number of scenarios where you aren't over-leveraged by any stretch of the imagination. This haroldg character is certain that only his version of the world is true, you must be over-leveraged if you can't take delivery. He's the one claiming we're mutually exclusive, I'm arguing exactly the opposite!
Smart well meaning people can disagree forever on the role of speculators versus "true hedgers" in the market. However even if you buy the idea that markets are only for "true hedgers", the concept that you can't have a cash settled product in such a market is asinine, that pretty much rules out the entire cash settled futures industry as "without purpose" according to haroldg's view of the world.
I agree with you that not ALL option traders are cash constrained as you correctly pointed out using verticals. But as an energy trader I can tell you that 98% of physical players abhor the cash settled futures. The amount of manipulation in cash settled futures is staggering. You do NOT want cashed settled products. You want options that can be tied to physical so ARBITRAGE can take place and force convergence. Without physical, no true arbitrage can be guaranteed. This also wreaks havoc for option pricing models who all use the no arbitrage pricing mechanism to price options.