It’s a “cheat code” kind of thing. Are games more fun when you’re invincible? When you have the best weapon?

I used to play games with cheat codes. They don’t make the game “more fun” outright. They allow you to condense some fun into a shorter chunk of time, then the game subsequently has less replayability.

Deactivating weapon durability might make the game “more fun” in the short term, at the expense of reduced long-term playability. So it’s no surprise that people who activated this particular cheat code had an experience like that of most cheat codes, reduced long-term enjoyment.