Did I say it’s impossible? What joke, even in D3 it’s possible, but someone has to sacrifice 24 hours or more straight to kill RG with naked run. Possible doesn’t mean viable. Same for MOBA, a level 1 naked can kill a max level 6-slotted too, so? The possibility is always there, take your chance.
The problem with D3 is that GR is limited in time. But bosses in D4 won’t be, so take your chance too.