The Marvel / Disney effect, CGI is so commoditized that you have far less truly passionate, highly skilled individuals working on CGI as an 'art', rather than to knock another scene out the door.
You also have to consider that 99% of digital effects nowadays are unnoticed because they supplement the scene (like vehicles or crowds or physics simulations) rather than act as a point of focus. You don't notice all of the things that work right, you just notice the things that don't. And nine times out of ten, that's just because of crunch.
These people are the hackers of their domain and it's disappointing to see people on HN dismiss them as hacks simply because they work for large studios. Meanwhile having FAANG on your resume in any capacity automatically signals you as an elite among elites.
I’m sure many (most?) CGI artists would enjoy taking more time, but the business need (and their need for a job) trumps that. You can draw parallels to software development there too