I think
@alex08060 didn't so much mean a literal spin-off as we know the word, but it opened up the way for more Star Trek on TV. And that is what Discovery did. The people that loved it wanted more, the people that didn't made the producers realise there was demand for more and different Star Trek.
Because people, not all Star Trek needs to be for everyone. We got Star Trek in all kinds of shapes and sizes since Discovery season 1 and you can't win them all, but a lot of Star Trek fans were happy with one of the forms of Star Trek we got since that first season. And we gained new fans! How friggin awesome is that?
Yes, I know the haters will double down on the Disco/NuTrek hatred now. Go for it. No one cares except for you.I gl