> I think the problem with making so much procedural is that it misses the point that the game should be fun to play. What's the game-play difference in having random trees or dependent on sunlight and rain? In the end, they are just a bunch of trees :-P

Because when things "make sense," players pick up on it and use it to their advantage (and feel very clever). Given a procgen survival game where you are in a desert, trees might only grow near water, so if you are thirsty, you might look for vegetation.