If the only thing you needed infusion for was for that dungeon (while still a stupid mechanic) I would be fine with it. They could have made it so people that need the grind would have to do it to infuse their exotics. But They have also bumped up the stats which will effect other parts of the game.
You can say the grind isn't mandatory which is true. Nothing is mandatory, if I wanted to I could sit in the starting area on 1 character and never progress at all.