Reever: I'm really not well versed in Dr. Who technicalities,
Clearly, since it's Doctor Who, not Dr. Who :D
Reever: but the guy gets reincarnated every time, right? Are there any lore-related stuff that say the reincarnation can't be female?
Technicaly not anymore, since they shoehorned plenty of "hey look, that other Time Lord regenerated into a woman" lately, but that not the way it was for 50 years. Like I said before, there are other instances in sf of aliens that change gender - for example in LeGuin's phenomenal Left Hand of Darkness or in Star Trek, but in those that fact has always been there and is part of their culture as a whole and the identity of particular characters. Here after 50 years of it clearly not being a thing it just feels like a really awkward and forced retcon.
Reever: And in Western comics etc. there are reboots every few years. Changing gender shouldn't be that big of a problem. It's more in our heads, because that's just what we're used to. Gotta try to have an open mind, at least.
That's true. I've been saying all along that it's all very subjective and I've mentiond superhero comics often. Because it's true - stuff get's rebooted or retconed there all the time. But always when that happens there's people who are on board with that, and those who are not. I don't think anyone likes every single iteration of Batman or Superman or any other superhero ever introduced. You always have to sort of "take what's yours and leave the rest". You can take any of a number of examples, like Wolverine's origin. It's not even a bad comic, but I always felt like the very idea of giving him a definite origin is a bad idea. I liked it more when his past was a mystery and "Logan" was all we had as a name for him.
So yeah, it's important not to rage about this change, and the people behind it, but it's also important to acknowledge that it's perfectly all right to say "thanks, but no thanks".