Fandom containment is breaking. Beginning of a new trend in Ten Forward?
Mutating from going too fast is a better origin than an immortal mysterious child from a mysterious universe that forgot all their memories of said origin.
Which is a shame because there was a crumb of goodness. The space cops plot with the future doctor trying her best to be retired was such a unique idea.
Oh, just the usual retcon of established lore that happens every decade or so. Only this round was very poorly written despite how much I enjoyed the portrayal of The Doctor by Jodie Whittaker.