You're absolutely right of course. Just shining through with my overwhelming ignorance
Can't see a time I will have access to risk-based haircut myself 
Can't see a time I will have access to risk-based haircut myself Quote from optioncoach:
Well if I can quote from my legal profession citing hearsay, I cannot accurately testify as to what someone else would do in a situation, only what I could do. Reg. T was not intended to protect you, it was to protect the brokers lol. The haircut could never be any bigger than the max loss of the position so as long as you do not expose yourself to a maximum loss greater than your capital, the haircut cannot eat you up. So if I have $100,000 and use haircut risks, as long as I never do more than $100,000 of credit spreads, the haircut does not make my trading riskier, it just requires less capital/margin up front.
So the risk management approach should not be changed, in fact risk management should be improved because the haircut actually takes into account what you could REALLY lose as opposed to simply applying margin requirements blind. So if I add hedges to a credit spread, the margin in retail accounts does not change but the haircut recognizes I have reduced my risk so my real loss is reduced. I think the haircut is more realistic in that sense.
Any trader could abuse his margin allowance and blow himself up whether it be Reg T or risk-based haircut (Under Reg. T you could short stock and get wiped out on a large unexpected move).