I say the opposite. Do it on T13. I did, and in HC too. It is boring AF on normal. It’s even more trivial with a pure speed build.
I mainly did it because a) I was bored wanted to see the cut scenes again c) half my clan that is playing HC seasonal hasn’t completed HC story. So when the roll over happens, some one needs to give them the mathael check point. d) see what legendaries drop. I clear each act And ID all the legendaries at the end.