It really depends what your goals are. I'm a perfectionist and I used to think just like you. But one day I realized getting "better" is overrated and ring games is all about the money for me. That's partially because I'm not that talented so even if I tried, I probably wouldn't get that good.

Besides, playing 1-2 tables at high(er) stakes requires MORE concentration IMO than more tables at your familiar stakes.

NB: this does not apply if you are playing less than 100NL