1) Depends on what rank u at, it takes skill to farm pp in higher ranks
Especially in Top 30 range
2) There are many kinds of skill in CTB. (For current mapping meta) Farming pp allows you to gain consistency, stamina, speed, and pattern readings. I honestly don't understand why a lot of players say that farming pp is easy lol Nothing is easy to begin with, you just gotten used to it because you played it the most. Doesn't matter if the system is changed, players will get used to it at a certain point and they will whine again. If you look back into 2015, shit like Genryuu is hard, no one can FC except like 3 people, but now almost anyone can FC because we are used to the hyper chains meta.
3) Repetition