Part of your review is just outright wrong. Discovery does not retcon anything else in Star Trek. I keep seeing that complaint a lot but it’s just flagrantly untrue. Most of the things people point to, like Spock having a secret sister, aren’t retcons. They just weren’t mentioned in the past and it lines up with established personality of Spock. He never mentioned T’Pring to Kirk or Sybock.
The closest thing people can point to are the holograms or the DOTs but if you want to blame someone on that you’d have to start blaming Voyager. They established that holograms were active in this timeframe. Enterprise also showed those holographic training orbs so the idea the tech would be extrapolated to a mini-VR training area within 100 years is entirely feasible. The Animated Series also has ‘The Rec Room’ which was a proto-holodeck and the show is proving to fall into canon thanks to Lower Decks. As for the DOTs, there’s nothing explicitly that would ruleout their existence in the first place. Just because it wasn’t mentioned doesn’t mean it doesn’t exist.
As for the graphics of the show lining up, yeah. CBS openly said that Discovery was a ‘visual reboot’ so things were going to look similar but not the same, as evidenced with the new awesome bridge we got for the Enterprise. A new update of an old classic. It would be kind of insane to suddenly downgrade everything into looking like it was made of cardboard and jolly ranchers.
I’d also argue pretty heavily against your complaint of “technology that doesn’t match the era”. Both of your examples are Section 31 tech. Given all the other crap we can see that they do, it doesn’t remotely surprise me that their tech would be a bit more advanced, even more so when you consider that this was not long after a war where every resource was going to attempt to stop the Klingons.