Everything except the losing interest part is what people love about factory games. So while they have your interest, realize that you are absolutely playing them “correctly”. But if you don’t like iterating your designs (not everyone does, and that’s OK), then these are probably not the right genre for you.
Yeah, I have to take breaks sometimes and be in the right mood. I find that I like to play more when I’m going through a boring patch at work and I need something mentally stimulating.