As a student pilot currently at a non towered airport...I don't dispite any of this, I am not experienced enough to do that but I can say where some of it comes from.
I'll start from the most understandable reason a student might do it.
7) "any traffic please advise" I'm a low time student right now. When we are about to enter the runway i am so dependent right now, because though my instructor has kind of explained, he hasn't gone into the detail I would like, I am just not getting the big picture yet, so we are a holding alpha, he tells me to turn right, check the skies, turn left (direction we will taxi) check for incoming aircraft, announce to the local "entering and backtracking runway XX For departure" and enter the runway.
This is one of my biggest fears. I haven't put together yet how far away a plane coming for landing might be that could be out of sight for me at the moment and yet if I take too long, I'm in the way of?
I have never uttered phrase number 7 but I feel the desire to do it, and only don't because my instructor knows. But I don't. Alone, I would not do it out of arrogance (not sure why that description crept into the the tirade) but out of being extra careful. I don't know how long after I went over to freq. someone already just announced they are on approach, etc.
I believe that this phrase is redundant and not necessary, but I have a ways to go before I can trust that I know who is where and doing what.
I understand the other ones, and also like them. Local landmarks, IFR phrasing, not good. "Ah...um" not good.
4) this one was on my "cheat sheet" for radio calls one instructor sent me. The same phrase actually. Start up the plane, "xyz traffic, Nxxxx, request radio check 119.1" (ok that makes sense) but then "xyz traffic, nxxxx taxi from hangar to holding alpha" my next instructor said "there is literally nobody else taxing, so this is not necessary" so I get the idea it is situational. There are times when it is good to do of lots of airplanes taxing all around you.
I did wonder if it is acceptable to answer "Roger" for a radio check reply. My nature is to say "thanks" when I get a radio check reply...how do you do that or should you ?
And if you don't get a reply, it could just be nobody else around...so..what? You just assume the radio is ok?
I guess you have to.