Abstraction is a an abstract word, but as an example, I would consider the process of refactoring a big piece of code which mixed together api requests and view presentation into a 2 classes (a presenter, and an api client) as adding abstraction, especially if those new components are defined by interfaces.
And I’d rather work in a codebase where the owners are constantly doing such refactors than not.
edit: if you feel the need to downvote, feel free to share why you think my question is problematic - I think that "poorly written" to describe excessive code file sizes is such a wooly phrase as to be basically useless in a discussion like this, and when examined more closely usually comes down to "poorly abstracted". But I stand to be corrected.
And I’d rather work in a codebase where the owners are constantly doing such refactors than not.