If you have 0 passion for programming and land a gig at a corp that doesn't care about code quality at all, you could do that job for few years and just coast/do bare minimum.

I'm an IC and I could deliver software with all methods in a single class, nobody would care I think, as long as it worked as intended. I happen to like programming and as I am improving my skills every time I touch an existing project I look for things I could have done better. If major changes are being made, I often upgrade frameworks or do a partial rewrite to improve things.

I know people who just do stuff without trying to understand why. If I cannot explain why I am using dependency injection and what problem it solves, I am not doing it correctly.