About the only thing I can agree with you on here is I don’t like when people on Wikipedia archive a link and then list that as the primary source in the reference instead of the original link. Wikipedia (at least in English) has a proper method to follow for citations with links and the archived version should only become the primary if the original source is dead or has changed and no longer covers the reference.

They should also honor a DMCA takedown and robots.txt, but at least with the DMCA I’m sure there’s a backlog. Personally I’ve always appreciated the archive’s existence, though, and would think their impact is small enough that it’s better to have them than block them.