(I don't see many "AM rebroadcasts"..some even have HD3 channels!)

You missed a few.
You also missed that many of these HD 2 and HD 3 channels are the same
playlist as other stations in the group.

For example?

There's not a lot of innovation here.

What are you expecting? Howard Stern? Oprah Winfrey? How's that working
out for the Sat Radio companies?

Certainly not a lot of alternatives.

21 Streams are not enough alternatives?

Maybe you should buy an HD radio and discover what's really out
there..instead of
parroting whatever negative information you may have heard.