You hear people say that there's too much CG in movies today, but CG is what allows me to take a green-painted wall in a studio and make it disappear, and then put 100 miles of landscape in. CG, in the right hands, can be a marvelous tool.
I've learned never to count Vin Diesel out. Just don't do that. And I guess it's because he is a very smart guy. Smarter than people give him credit for.
You do a drama, and you are limited by the rules of reality, and in science fiction, you create your own reality. Some people find that daunting; I find it challenging.