-There's an element of cynicism to the entire thing. It gives the writers free reign to use as many pre-Hartnell incarnations as they want. Now, you can point to Hurt's War Doctor, but a) that was driven because of Eccelston's refusal to return to the show, and b) it actually puts in the time and effort to explain why the War Doctor is different enough from the other incarnations, and even gives him a redemption arc of sorts. Ruth, however, is just thrown in there. And in what I might actually call a case of being 'woke,' it's telling that the Timeless Child is a girl, and Ruth is a woman, and...I dunno, it feels like they're saying "see! The Doctor was always a girl from the start! How dare you complain about a gender flip when the gender flips happened a long time ago!" Well nice try Chibnall, but you're not fooling anyone.
-Even despite all that, I might have been more willing to forgive it if it was handled well in the present, but no, it isn't. The TC revelations mainly come from the end of series 12, which is the Master monologuing. Yes, we get visual flashbacks, but there's so many more interesting ways to do it. Consider the War Doctor again - Eleven didn't just monologue to Clara about what he did in the Time War, it SHOWED us. We see the War Doctor go from this figure of dread in Night of the Doctor, to the Day of the Doctor special where he's redeemed in-universe and out-universe. And recently, in Flux, when Thirteen meets Techteun, her 'mother,' it can't even get that right, because she's killed off in minutes, and we're back to the Ravagers/Flux nonsense.
So, yeah. Not a fan.
Ah but going forward the idea was for the company and continuity to pretend to a greater or lesser extent that past didn't exist anymore.
First, retcons/reboots are common, especially in movies and games, and absurdedly common in comics. This isn't new, and while you didn't say so directly, there's nothing "woke" about this.
But as to those specific examples:
John Connor isn't the saviour of Humanity anymore
Are you referring to Dark Fate?
John being popped off like that doesn't bother me, though I can understand why it would for some. If Dark Fate was the only piece of T2 media in existence, I might be more upset, but even then, John's death isn't "let the past die." Dark Fate presents it as a tragedy, as Sarah explains "John was killed by a Terminator from a future that no longer existed." Furthermore, his death hangs over the entire film, from Sarah's grief, to Carl's "for John," to the idea that if there's always going to be an AI that goes rogue, there'll always be someone to rise up against it. John's death is thematically different from anything in Last Jedi.
Also, again, this isn't the first time it happened. Sarah Connor Chronicles hinted at something similar in its finale (though to much less effect - I despise the show, but that's another matter), and other Terminator media has done similar things, to "Jane Connor" in one of the comics, to Genisys. There's multiple Terminator timelines, so what happens in Dark Fate doesn't affect others. It doesn't change the franchise because by its nature, the franchise allows for multiple timelines and outcomes.
Luke didn't restore any kind of balance to the force nor was some great hero as the Extended Universe novels were made non cannon
The old EU was non-canon well before Last Jedi. I understand why Disney did it. I think they could have been more careful with it (e.g. there's no reason to retcon pre-Ep. 1 stuff IMO), but if Disney was going to make sequel films, there's no way they could expect moviegoers to brush up on decades worth of EU material.
As for Luke not restoring balance to the Force (whatever that's even supposed to mean now), I understand the complaint, but it's a complaint that I put at the feet of Rise of Skywalker, not Last Jedi. Last Jedi actually explored the ideas of legacy, failure, and growth, Rise of Skywalker just brings Palpy back, and can't even be bothered to explain how.
Captain America wasn't the one who punched Hitler
The Emperor of Mankind didn't make the Primarchs he just claimed credit for some-one else's work
I'm sure there is more I could bring up.
Not sure about those two, those are new to me.
But yes, lore shifts and changes, and old lore can be recontextualized, for better or worse. This isn't a new practice in fiction, and there's nothing inherently "woke" about it. 40K for instance has always been recontextualized - take the necrons and tyranids for example. Their incarnations now are very different from how they started out.