Mine is the lag in Stellaris, and lack of options to let me impact it. Like let me disable the ability for the AI to make habitats FFS!
Factorio: It’s too addicting. You just want to keep going, even though you have better things to do.
Games like that are also notorious, at least for me, where I constantly am like “ooh if I start a new game I can do X differently, I wonder what that’ll be like…”
Okay that’s cool, but after spending 20 hours setting that up… slightly different looking, but in a way that requires you start over entirely?