Hmm I guess for me it would be stuff that I can sink a lot of time into, that isn't just a time sink or a grind. Like... if I can't get past a certain point for something and all I can do is JUST wait because that's bottlenecking, that's bad design for me. Likewise, if I have to do the same repetitive task over and over, and there's no prospect of, once I've done that a few times, having that tedium alleviated... again, that's bad design. And that can be as simple as having a later game autocrafting solution - because even normal crafting can become a pain when you have to do it over and over. If that autocrafting also allows using fluids where previously you had to use individual buckets and all the annoyance that involves? All the better.