I said a while back that I was gonna change my name due to my obscene displeasure with the final season but... nah. I'm Stamets. I love my lil gay boy and I love his lil gay family and I love the ship with the weirdly long nacelles.
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 the nineties? And it was just presented as it was when they were filming? 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.