Show runner Russel t. Davies!! He had such a light touch with "controversial" subject matter, never talking down to the show's audience but just having the Doctor put a bigot in their place with just a smirk and a hilarious cryptic comment (especially lovely #10, who's reappearance on the show I missed entirely, along with the hilarious Donna Noble's return- I got some catching up to do). If Davies thinks having a trans character is important it's probably because of recent developments in the UK with all this anti-trans "gender critical" bullshit and he and his writers will handle it organically + seamlessly, with wit and brilliance. Cris Chibnall's heart was in the right place (he wrote some great WHO & TORCHWOOD episodes) but as show runner he had poor Jodi Whittaker up on a soapbox every week heavyhandedly EXPLAINING why racism, sexism etc are bad in a way that just didn't feel like the Doctor. Like so many of society's recent woes I blame a certain former world leader for making TV writers grow a bit too strident in refuting the evil mindsets he gave his presidential blessing to. Looking forward to meeting the next Doctor too...
~hugs, Veronica