Why do so many people have problems with bass?

I mean such obsession with bass. Does not your systems play bass?  Is it the quality of the bass?

Maybe my system does a really good job and I don't perceive any problems, or maybe I don't know I have a problem.

What is so challenging for systems to produce quality bass?

Is it that they don't hear enough thud?? What hertz range we talking about? It's a pretty wide range.