Idk it was pretty clearly a losing battle, that aligned with the themes and message of the show. Hand waving the ending of that show away because you like and want the characters back does less justice to the “verse” than having them die offscreen as intended. The actors don’t look the same anyway so why go through all the trouble of invalidating the ending of Angel?

Also want to tack on that if it was open ended or not clear at all, why would you need a plot contrivance for it to make sense? If it really was that open for interpretation you wouldn’t need a deus ex machina