I've twice had very bad experiences with ISTjs I've worked with. Maybe three times because people here typed a description of another person I haven't worked with well as ISTj.

They are extraordinarily inflexible. What they planned to do on Monday is what WILL HAPPEN on Wednesday, regardless of what happens on Tuesday. And it has to happen that way because that's what the employee manual says. If inanimate objects have types, employee manuals are ISTj. No point arguing with them because they won't budge. I want to pull my hair out just thinking about it.