i feel like the answer to what is and isn't canon can be summed up with;
Why do the klingons look different?
They always looked like that, you just didn't notice before.
Canon has always been squishy. The Eugenics Wars takes place in the nineteen-nineties... oh but didn't Voyager's crew visit our nineties? Plus, DISCO had that Elon Musk name drop.
...so the timeline floats up as the present day does. Canon is just a vague sense of the things everyone agrees on.
Personally,
I really dislike the fungus engine. You expect me to believe the Federation developed instant, consequence free warp but gave up on using it on literally any other ship? Silly. Very silly. Oh, but the precursor civilization doing a galaxy wide Genesis project is somehow an unimaginable technological feat.
And yes, I know STE covers the klingon flu. I just think They always looked like that was more elegant.
i hate that smooth-rectangle has become the standard
stop it with the extra cameras and the beveled edges, i'd give up half my screen space for some real goddamn buttons