Just a few that come to mind immediately:
* The NuWho companions constantly being young women from modern UK is boring and over played
Probably why 13 had a young man, an older man, and, later, a middle-aged man as companions.
* The Time Lords and Galifrey existing is only a positive for the franchise, there is no reason to kill them off when even in Classic Who they barely factored into The Doctor's adventures even when they were at their full power. The Timelords being around don't prevent any type of story, and destroying them again was just the showrunner(s) being petty and shortsighted.
* William Hartnell's Doctor was the first Doctor, there is no "Timeless Child" or "The Other" and the constant attempts at retconning him as not being the literal 1st Doctor is shitty and disrepectful to the character, the actor and the show in general.
William Hartnell era fans: Time Lord? Gallifrey? What on Earth are you talking about? Next you'll be saying the Doctor has two hearts, or he can change into another person, or some such retconning craziness.