Welcome to the WBF. Great (first) post. I would add that even in a well treated room moving the subs a few inches may result in noticeable change in sound/performance. Else I agree with you.
All true. Plus, room treatments for low frequency problems aren't cheap by any means.
It's not expensive to add superchunks to all corners for useful velocity absorption. And for serious listeners with a reasonable budget, compound baffle absorbers for pressure absorption are affordable. Not cheap, but affordable for anyone investing serious money in their system. One good thing about CBAs is they are easily retrofitted and can easily travel to new abodes.
The problem audiophiles have with room treatment can essentially be boiled down to "it doesnt seem to DO anything", unlike (say) a really expensive room/speaker EQ with beautiful glowing lights and gleaming facade. There's no pay-off in showing their latest purchase off to their friends...and (aside from the inital setup) there's nothing to obsessively and endlessly tweak.