The rationalisations I've read here are less than paper thin. Cloaking devices? Enterprise did it first so it somehow doesn't count.
Alternatively one could assume that the DSC and ENT versions of the claoking tech were so far removed from technology the Romulans in the 60s use that it would be like comparing technology that hides you from radar to throwing a grass colored sheet over yourself while sitting in the woods. I'll admit this one is problably thinner than paper. I'd be open to moving the two conflicting lines from Kirk and Spock into another timeline or universe or just ignoring them.
Bald Klingons? It's a style choice but you have to ignore the stated intent and reason of the creators as to why they're
bald.
We can completely ignore intent (both that it's meant as a style choice and the reason the producers gave for baldness) as it's not on-screen and rationalize the Klingons as them being Klingons who tried to cure the Augment virus and "overshot the mark" the mark, so to speak.
New Enterprise is too big? Oh the old one was that big, they were just BSing you with a half century of technical books.
From what I can tell there is no evidence for the Discovery's size on-screen but there is very, very flimsy evidence for the Enterprise's size, so for the moment I'm fine with accepting the Discovery as about 300 meters or whatever the Constitution class's size was. Again, screw intent.
Even the biggest DSC continuity apologist on this board can't excuse the new Klingon ship replacements.
Well, considering that both the Romulans and the Klingons had two different designs for BoPs so far I don't see a problem with assuming that it's a sort of ship classification akin to the heacy cruiser or whatever and that DSC BoP was just a different class. The D7 is admittedly a bigger problem, as it's actually identified as a class. A possible rationalization could be that it was a refitted D7 class ship, akin to the refit Enterprise that is still called a Constitution class. Personally, I think they really missed out by not having it be a D6 or something which would have been just as nice an easter egg for the fans, cemented it as a prequel and would have still meant nothing to people who didn't know the D7.
Basically my overall point is that since Trek has a multiverse with an infinite number of universes we can have
A) A universe where all the Trek canon material goes into that makes sense within itself due to rationalizations that we don't see on screen but are possible (and since we have an infinite number of universes I don't see a problem with everything rational happening, even if it's unlikely or not intended by the creators). And
B) A number of universes which all have snippets from Trek canon that would contradict each other without any rationalization and that in and of themselves flow into different and unknown directions.
What I'm saying is that we can literally have it both ways without them conflicting.