What if I miss my RSS feeds from PHPBB?
Seems like there is some interest in the Discourse community for this being added: https://meta.discourse.org/t/rss-support-for-categories-topics/2075
Hmmmm… already works, kinda. Just add .rss to the URL. http://lib-pel7dev.lib.sfu.ca/c/meta.rss . Not a comprehensive threading, but maybe better than nothing?
Listserv style email subscriptions seem to fit the bill for me.