I feel like you need to watch TOS, just to understand Kirk, Spock, Bones, Uhura, and Scotty. Also, how so many tropes came into being, like red shirts, and transporters, and time travel, etc. Why some of the props and control panels look the way they do, why there's a handle in the turbo lift. There are references and call-backs dating back 60 years to the original series, and you'll miss them if you don't watch it.

But, not only in the ST universe, so many other Sci-Fi media reference TOS and the rest.

Don't miss The Orville, either.