Interesting interview comments from RTD where he talks about the Sonic redesign being driven by - of all things - RTD thinking that the 'pointer' design led to the Doctor pointing it at threats a lot, like a gun, and he didn't like kids copying that. Thus the flat TV remote-esque design. Really interesting comment. Like, he is right - Moffat even identified this and mocked it in Day of the Doctor, with the War Doctor looking at 10/11 pointing their screwdrivers menacingly at soldiers aghast, thinking it silly. That was something RTD's era introduced - the past screwdrivers weren't held in a way where it could be pointed 'at' something in that way, and though Eccleston didn't do that, Tenannt was doing it in practically every episode, as did Smith. And Capaldi used it less, but then closed out his era by literally pointing it at Cybermen to kill them, also, to be fair.
It feels like he's spent a lot of time thinking about decisions he's made, and musing on things the show has said since. The Davros stuff spoke to that and this feels like another example, really.