There isn't a single sensible argument to not implement both.
Even in a dreadful worst case scenario where Larian would decide that reactions are perfectly fine as they are now, there would be virtually no downside to implement both Ready action nor dodge.
That said, on a personal note I'm not particularly concerned about the latter, even if I can see it turning situationally useful. I can't see myself choosing too often to pass a turn just to get a defensive buff, generally speaking.
Last edited by Tuco; 11/07/22 11:12 AM.