Quote Originally Posted by rabbitzero View Post
The problem is that someone would figure the most optimal one, and every one would do those choices. nothing would change.
Which is the problem you have with multiple ways to do the same thing. One will be best. Then you have one real option.

But what about multiple ways to many different things, and each of decent value? Different options can come in the form of 'more to endgame than just dungeon-grinding' as well. Or at the very least, more than one, distinct, dungeon per niche.