People complain about lack of bass, not enough mid range. Solution?

So I've read that when people change their systems they're unhappy with the bass and then when they get more bass, they have a problem with the mids not being as vibrant.

So why is all this happening? Is it because Single amplifiers supplying a multi driver speaker create chaos between the drivers with all the feedback and whatever.

doesn't this speak to merits of a biamp solution? I've been biamping for the past several months and the sound quality is remarkable. There's plenty of power across all drivers and they all seem to have independent freedom they didn't have before. No issues I can discern anymore aside from Recording quality issues.

 are people living with inherent mediocrity even when they're spending a lot of money on pretty components.