It's not really about consistency imo because like I don't care if someone is consistent. It becomes a huge issue when their lack of foresight ends up fucking something up for me, then it gets fully intolerable. It also, most of the time, makes them inefficient as fuck - another irritating thing. The 3 closest people in my family are all Si leads (two SLIs and an SEI) and they all suffer from this issue and it makes my life so much worse, I can't wait to move away from these people.