Sorry Ixixly, I have to call you on this. The OP asked a series of simple questions and you reply with:
You're going to make an excellent Pilot mate.
in a smart ass way.
Then you carry on with garbage about the TC being preferable to an AH because you can fly a balanced rate one turn. How about pitch attitude? What do you think the chances are of someone who can't fly something approximating a rate one turn on an AH maintaining level flight on limited panel? Hey, at least the spiral dive would be balanced.
I understand the name turn and bank indicator is sometimes used but really is a misnomer because the thing doesn't indicate bank. A turn indicator indicates rate of turn. A turn co-ordinator indicates rate or turn and rate of roll (due offset gyro axis) but neither directly display roll or pitch attitude.
Agree that the rule is there for inadvertent VFR into IMC and really is outdated. When the thing was written, aeroplanes had turn indicators more than AHs.