Seen the same thing happen with devs that proud themself to write “simple” code. Sure, every individual script they write is simple in itself, but in the end you have thousands of them that don’t compose or reuse at all, with lots of implicit dependencies and assumptions between them. Leaving the rest of the team slowed down, trying to make sense of it, careful not to add even more to the existing mess, while mr “pragmatic” keeps adding even more copy-paste. Basically the total complexity becomes bigger than the sum of its parts.

What you bring up is a common and concerning scenario. It would be better received without the accusatory tone, until you know more about actual situation. There are many good and fast developers that don’t apply to this concern.