All of this is true, and no matter how much you do it, it's still all true.
I can't even keep track of what I'm supposed to do at my own home airport that I've been to thousands of times. Some people know me on a first name basis there, and still act judgmental when something was (seemingly randomly) changed and I don't know about it.
TSA is by far the worst in the USA though. Their expectation that you do exactly what you should, without telling you what to do, while constantly changing the rules, is infuriating. Often there'll be 2-3 lines and DESPITE HAVING THE SAME SCANNERS, they'll have different unspoken rules that you are literally yelled at over.