Also 2': you come in grad school to work on thing A, sub-thing B with method/tool C and your advisor makes you work on thing X, sub-thing Y with tool Z. Working

Also 2': you come in grad school to work on thing A, sub-thing B with method/tool C and your advisor makes you work on thing X, sub-thing Y with tool Z. Working on something you don't really care is way harder and a bit soul crushing. 3': you can be in a situation were you are micro-managed and required to do tasks for your advisors slightly or not even related to your subject. In my lab we have two weekly meetings, and during the Friday on everyone need to report. I feel spending more time doing powerpoint than research.