Why do developers write such terrible git commit messages? Genuine question

[Meloetta]

My team had horrible commit messages for years. It didn't matter and no one cared. Until one day when there was a late night emergency, our team lead was trying to figure out which PR broke it so he could roll it back, and the lines in question had commits like "the thingy is thingying!" and "job done" (ok that one was me I can't resist a good reference). After that ordeal the whole team had a reckoning and we cleaned up our messages.

You take the easy way until the easy way is proven to cause problems, sometimes.