The Quiet Crisis Unfolding in Software Development
medium.com
medium.com
I've seen this: young developers who get things done quickly, but when you look closely at it, it's not really well architected and ends up needing a lot of fixes and changes. And worse, as said here, it's hard to read and maintain, and seems to have almost no commenting so it's very hard to understand quickly what's going on when you're not familiar with that code.
Most likely, people who don't comment have the exact same mentality you have ("this is write-once, no one's going to look at it"), but the problem is they're wrong. Other people do come back and need to change it later.