mechmouse: The biggest issue I have with the series is the complete disregard for any continuity. I can just about ignore the awful "science", but the writers just can not seem to keep the world coherent.
I love that. It's part of the show's easy-goingness. Always something that prevents it to take itself TOO seriously. My favorite exemple is :
https://www.youtube.com/watch?v=MtdoPUQimJg Yes, the Tardis is supposed to auto-translate. When asked about that, the authors just answered that they went for the fun. What can I say. Don't overthink Rick & Morty (which also features genuine drama and clever characterizations).
As for the actress' age, I don't find it any more important than her gender. It's all about the delivery. Matt Smith gave us a sense feel of century-old wisdom pretty efficiently at times, so do all young doctors [i mean, in the series. aah, whatever].
I just with they wouldn't spoil actor changes before the actual in-episode regenerations. That's my only gripe with that announcement.
tinyE: Tort's idea of "race-bending" is an honest upstanding character being played by someone who isn't white. :P
It's actually
very interesting to see, especially in the contect of the Doctor's physical "regeneration", what traits different individuals perceive as defining a given character. In this specific context, where the in-world establishes physical (and party psychological) transformation, it's very telling about what people classify as contigent external traits or core-defining essence.
We've had age change, hair colour change, mannierism change, personality change (to some extent but still notable and lampshaded), accent change. These were each time "the same person, but different". Now, sex, or skin colour ? Let's see who starts screaming "waargh character betrayal" about what, when there is not even a literary description's elasticity to negociate (unlike, say, James Bond's fluctuating but loosely predefined body). Let's see what exact barriers to identity sharing remains, once we've accepted all the elements that have already been regenerated differently in the past.