This is heavily discussed in my group as well. In general people don't like the +level to everything. The size of the bonuses eclipse alot of stats and proficiencies. I want progression but in my group most people seem to want a +1/4th level or +1/2 level to find a suitable balance between storytelling, range of NPCs and monsters which are viable encounters at any given level.
It is a gamist mechanic but it also reflects experience and the goal should be to provide a good gaming experience.
AC generally scaled with other things in PF1 (magic items and similar) at a higher rate than +to-hit did so I think that is why people didn't think about it as much. Also, the pf1 level 10 wizard did scale with half their level meaning that the difference wasn't as big as it is in PF2.