It’s a single player game, let people play how they want.
Hell, I used respec on all my companions so their stats weren’t all over the place. I used it to change Shadowheart into better domain with better stats.
Sure, if someone wants to abuse it, they will do it anyway. But the same could be said about mods.
There are already plenty of overpowered items on the nexus. Respec is nowhere near as much of a problem.
It's not like you are competing with each other. And as someone, who modded other games, respec is something that would probably get modded in sooner rather than later.