Oooh, oooh, another argument about canon and I didn't jump in until page 4
I don't really sweat 'canon' all that much. The Star Trek PTB tell us canon is anything on screen. I view canon as something for the show runners to worry about, and tie in authors. And show runners can do what they want as long as it's ok with the true PTB at CBS. When it comes down to it the tie in authors like our novelists are really the only ones that have to worry about canon because they can't contradict it.
Now continuity, that I pay much closer attention too. I'd prefer a Star Trek universe with greater continuity (though being an entertainment franchise I don't expect perfection in every detail).....and yes, I'd prefer a greater visual continuity.
I'd personally love to see Discovery more consistent with a pre-original series feel (I do make some allowances--for instance I didn't complain about Enterprise's set designs because I could see they tried to balance making it looking futuristic with making it less advanced than the original series). I'd prefer smooth headed Klingons is another....and so forth.
But I don't get to make those calls.
As I don't do streaming I only saw season 1 of Discovery on Blu-Ray so far. And I do agree with some who have said it's easier to view Discovery as a reboot. Frankly I find I enjoy the show much more if I don't try to do mental cartwheels to try to fit it in with everything else. But I don't begrudge authors who included Discovery references in their novels or anything like that (and the references are hardly plot changing references anyway).
Now that may change in time. Maybe after seeing season 2 I will be able to view it through a different lens. But for the time being I just find it easier to view as a type of reboot.
To each their own though.