I, too, am not excited to take over maintenance of someone else's pet project, whose quality I am not capable assessing (and the "fun of starting" gone).

Coworker: We'll use Docker, Minikube dev setup,@#$%@.io and Unicorn-Lang, this will be awesomest! Me: Oh, have you considered boring tech? Coworker: ah, it's old, not how software is built today.

Also coworker: leaves 1.5 years later with with us having to pick up the pieces.