wut?
why are you thinking about that when you havent even experienced the whole game…
you cant seriously say change this and that, when you dont even know what the full 1-600 level experience is going to be
for all we know this game could be completely the opposite of what it is now, come release, the only criticism we can give is to the current state of the game and not its future, simply because we dont know how it will turn out.
just for the sake of arguing your points though, tougher mobs should be reserved for dungeons and the upper levels of content, where people are more comfortable with the game, squishy and numerous is the best way to ease newer players in, letting them experience the core gameplay of their character choice, before they level up and fight stronger and stronger mobs
that said the elite mobs, mob density and spawn rate in the later stages are way to over tuned, with elites being way too powerfull and general map density and spawn rates being way too low
the earlier parts are honestly fine, squishy monsters everywhere for you to kill, and tougher mobs inside the dungeons.