Very good list.
Wrt web2.0 I would consider the Hive frontends to be web2.0 too. I think the main difference is between the standard web2.0 apps like FB, Linkedin etc, and solutions like Hive.
Post recycling is bad if done for votes for sure. But sometimes I feel that Hive votes can stop us from doing things naturally if we think about it too much. For eg if I want to go back and add or edit my post it should be ok to do that. This is one tricky area of Hive that I notice as a newbie.
Thanks for writing this useful post for future newbies. Cheers from a fellow #dreemerforlife