Phew. That was quite an epic piece. I daresay you didn't need all 11 reasons to establish your point!

It's also interesting to look at "bitching" as a social fitness test. In other words, I believe some people will actually engage in actions, which may sometimes include bitching, in order to test the reaction of their partner. There may be a variety of purposes to this - confirm the partner is still assertive enough to qualify for attention, assert or re-assert control or dominance over the partner, etc.

It's not always happening just for, well, "bitchy" reasons. This can be useful for anyone to know, so they know how to react. As Neville Chamberlain found out, appeasement is not necessarily the best strategy: