Lets say this differently: If RTD had introduced a scenario akin to The Timeless Children, it would a)undoubtably be much more intricate and actually more respectful of the show's history overall, and b)the episode(s) themselves would've been a lot better. See, its not just that the concept sucked, although it - the plotting and character in it were abysmal also, making the entire thing a half-hour fan-fic infodump via the Master. Just terrible.
But what I meant to say is, if RTD had actually done something like this, it would've been much more appealing and fitting (thus actually interesting), and the story in which this reveal would occur would be immeasurably better. For one, it'd actually have the companions doing anything.