"Why don't you see it as just a simple choice that reflects the times that we are living in?"
Because Doctor Who isn't a character from the times we're living in?
If it was another male Doctor Who but he'd picked up a new companion from 2017 who was transgender there would be far less conversation about it, and it would be much more relevant to the times we're living in.
To me it simply doesn't make sense, it would be akin to Star Trek Discovery having a transporter accident that changes the Captain's gender and they decide to stay that way. It just feels like shoehorning a gender change for the sake of it.