>>24772174That's the main problem, though.
The more you try to outdo a previous iteration in a certain aspect, the more the audience expects that aspect to remain, if not improve in the next game.
Doing complex stories and characters isn't a bad thing, but in piling these things up excessively, it ruins the integrity of Pokemon, which, at its roots, is simply a game about catching and collecting mons. This is why you seldom see any semblance of complex story in Mario (need I mention Paper Star) and other franchises with no apparent expiration date.
Also with the increase in "complexity" is the increase in focus on human characters rather than Pokemon themselves.