Pretty tough not to mention alts in this discussion as they are usually the best place to test out ideas.

Considering Monero has used just about every form of privacy tech that was originally suggested for Bitcoin I think discusing how those techs are working out and which can be successfully imported.

And of course alternative techs like ZK-Snarks and ZK-Starks are good candidates for discussion and a discussion about Z-crap (w00ps slipped) would not be out of order when trying to gauge whether Zk-Snarks is mature and understood enough to trust.