so bass traps in corners do nothing, it seems we have been fooled. or are being fooled.

I’d say the type of bass management is completely dependent on your room 

It depends upon the type of bass trap. Some work best in corners others not. Look up the type of absorber and educate yourself. Don’t listen to Dennis. He is a BS artist and not trustworthy. You can check what’s best threads or simply Google his history.

I watched a number of his videos, then realized there were no constructive tips, just criticisms, and everything we do is fruitless and won't work. 

After a few cycles of this, I chuckled, and gave up. 

@ronboco. Agree. I have diffusion and bass traps in a smallish room with a somewhat low ceiling. Tough room but I definitely could hear a difference. I installed both at the same time so hard to know which had the most impact. I could certainly remove some and test though. 

A bass trap....would that be a girdle?