I'm not sure how much I accept the theory of the inflexibity of people. I think some of what we see is the result of people having an incomplete understanding of the issues affecting sound.
Bounded thinkers usually don't want to discuss theses -- they'd prefer talking about their solution. They do this because a discussion of the issues runs the risk of reaching the point where they are proven wrong. When forced back to discussing the issues, they often become quite dismissive once they reach a point when their position is undermined by fundamental physics.
It's as if somebody challenged their belief system, though it would be a stretch to say that they had a system at all. Only preferences, normally product based, and almost always occupying a place in their living or family rooms.
The points you raised about hard views illustrate this.
Subs in corners? There is no simple answer for this, but is very much dependent on the application. (Personally, I'd prefer to buy a sub with the necessary LF response that having to rely on room gain and all the issues that brings.)
Using towers in full range to even out bass? Again, no simple answer. One cannot simply dismiss the potential effects of having two LF drivers, in a tower, side by side at one end of a room. (Personally, I'd prefer a satellite/multi sub arrangement because it avoids this, and other effects, in a cost and performance effective manner. But there are times when the tower/sub approach makes very good sense. It's all in the application.)
80 Hz crossover? Yeah, that's the THX boiler plate but one is better off getting a detailed diagram of their speakers' frequency response and doing some spl calculations to figure out the logical crossover point. (Personally, I'd rather work things out on my own and get things as close as possible before expecting room correction software and a $30 microphone to do the heavy lifting.)
So all the boiler plate audiophile "dos and don'ts" don't mean as much to me as having an issues and principles based discussion on a particular application.
I guess that's why I'm so popular ;-)