Question + A Point

Kinda a jumble of thoughts but

A while back I first noticed people bringing up something called a "power creep" and various kinds like cdr creep, ms creep etc. Ever since I saw that I've been paying more and more attention to what I see in patch notes and the pbe.

Why aren't we just nerfing what's strongest, and saving buffs for champs that desperately need it?

That brings me to a point that I also want to make:

Correct me if I'm wrong but as far as I can tell, champs that are released weak are usually pretty balanced, it's just that every other champ is so strong currently that they appear weak. Kai'sa needing a hotbuff is an example, albeit I'm not sure how good of an example. Another that comes to mind is Taliyah, who was released extremely weak, who also needed a buff.

P.S Can't we just start nerfing champions more often than buffing, and add a small amount of true/%health damage onto towers and buff each tower the closer to each nexus they get?

P.P.S:) I tried out DotA 2 and (I may also be way off here but) In the bot games I played, damage dealt seemed so much slower and more methodical, every fight seemed to test me and it was a breath of fresh air vs the 2 second teamfights we have nowadays