Do a search for "autoliquidation" and you'll find literally dozens of threads, all related to IB oddly enough, from dozens of people who have experienced the same thing. IB depends on "The Algorithm" to do auto liquidations and "The Algorithm" doesn't properly calculate the max possible loss on vertical options spreads. Everyone is subject to the same code, and if you haven't been impacted than you either don't trade them or haven't been in a situation of wide bid/ask spreads being incorrectly interpreted as larger than possible losses by "The Algorithm". This thread involves spreads that would be subject to this known error.
Those are all simple facts, there's no "presumption" going on. If you trade straight stocks without margin, IB is great for you. Carry on, and don't feel the need to comment on threads that involve vertical spreads at IB. If you engage in anything that involves a vertical spread, and the topic of this conversation does, then there's a known issue at IB with that. I'm not sure why you're attempting to color that as just some kind of bitterness on my part, presumably to be ignored for that reason? Do you dispute any of the above?
I trade straight stocks but am looking for more margin than what IB offers, and am not a big fan of The Algorithm. Anyone better out there?