To me they should establish how different each Doctor is.Shadowstar38 said:To me, it's a pointless act from the start. But it can still be unobtrusive.
They started doing it at the start of Capaldi's tenure, he was far harsher than Matt Smith and didn't sugarcoat things for Clara.
Something changed though and his personality essentially became a copy of Matt Smith's Doctor, even down to the obsession with Ms. Oswald. It was like they'd given up writing for Peter Capaldi and just pulled a load of unused Matt Smith scripts out of a drawer.
That's when I stopped caring for Peter Capaldi's Doctor and made me wish even more that he hadn't left the Musketeers to take on the role.
Doctor Who fell back into the rut that really started with Tennant's ear on the show, the wacky Doctor who was maybe in love with his companion.
My big fear with this casting is that it'll just be ignored and we'll end up with that wacky Doctor again, just with a bit more jiggle. Make the regeneration into a female mean something more.