personally - as a TOS fan - I'd RATHER disown the retcon on TOS that was TNG and the majority of the 24th century era myself. YMMV.
I don't get why the sister thing is that big of a deal. As far as Spock may be concerned, he really doesn't have a sister. She's just some kid that lives with his parents. What's she to him? He's probably in Starfleet by the time she shows up. He's probably cordial to her on the rare occasions he sees her and that's that. In fact, Vulcans might find it illogical to refer to a child that isn't biologically yours as your "child". They're probably her guardians.
Jesus. Fucking. Christ. Another unmentioned Spock sibling. Yeah, have faith in the people who think it's a good idea to take the worst idea from the worst Trek film and do it again. Motherfucker. It's like bad fanfic.
On whole Discovery takes enough liberties with canon that one could never accuse them of being a slave to fan-sentiment. I also don't feel that rewriting canon in and of itself is some sort of sign of artistic integrity, nor adhering to canon artistically bankrupt. That being said, going to Comic Con and expressing snobbish disregard for fan sentiment on the basis of "artistic integrity" seems like a bad idea. You go there to project the idea that you actually care what fans think.
There's nothing in the rest of the lore that says Spock doesn't have 1000 brothers and sisters. Or Kirk. Or McCoy. Or Scotty. Or Uhura. Or any character we've ever seen. Just because it's not explicitly contradicted by established lore doesn't magically make it a good idea. Fucking fanfic bullshit.
Never forget "Journey to Babel:" KIRK: Spock, an ambassador has been murdered and your father is the prime suspect. SPOCK: Sure, that sounds like something he'd do.
Seems to be a pretty standard pro-fic trope. Mycroft Holmes doesn't show up until 1893, some eight years after the first Sherlock Holmes story. Supergirl was introduced decades after Superman's debut.
Can I ask why being Sarek's step-daughter is such a bad thing? It contradicts nothing, and the only negative I can see (thus far without seeing the show) is that it creates a small universe syndrome. Which, is neither new or unique to Star Trek.
Really? You don't think that these count? "She has an unusual and dramatic Back Story." "She has some sort of especially close relationship to the author's favorite canon character — their love interest, illegitimate child, never-before-mentioned sister, etc."
Unusual and dramatic backstories are common with a lot of lead characters. So no. No idea if Spock is a favorite of Fuller or the other people who created the show. I think her relationship with Sarek will be more important.
The adoptive sister can be a lot of things. She could have lived with Sarek's family for 20 years. Or she could have been with them for six months and Sarek just keeps in touch with her. On a different issue, did anyone notice Burnham was arrested in the trailer? She is escorted off the bridge and than in the exposed to space brig.