I have seen e.g. Skin talk:Blueprint deleted since LiquidThreads was added there. That's perfectly fine but there is still a problem. Is there anyone happening to know how to activate Flow on it? I have been trying to get an answer for this but I am afraid that there currently seems to be still not alternative to LiquidThreads on this wiki. I believe we do not want continue antediluvian talk on talk pages, do we?
Topic on Talk:Structured Discussions
Ah, this diff provides an answer. Keeping fingers crossed that the necessary user right was already assigned.
This post was hidden by Malarz pl (history)
Preventing more pages being signed up as LQT, once an entire wiki has been converted, is in the team's current 'sprint', as phab:T107068.
Converting more of the (both existing and redlink/empty) pages on this wiki, is being done at a slower rate. For the time being it is opt-in for usertalkpages (signup at Flow/Request Flow on a page!), and rollout beyond that is considered on a case-by-case basis. There is a desire to fully convert one or more namespaces (as has so far been done at Cawp/Catalan's Viquipèdia_Discussió: namespace, and throughout the WMF's officewiki), but there's no current timeline for that, or proposed plans for which namespace(s) might be first.
The userright for enabling Flow is currently just assigned to the Staff group (and only used by DannyH the Product Manager of Flow) and a roleaccount used by the extension itself.
A more open system (with a more advanced feature set) for letting a wider usergroup (e.g. admins) deal with this, is being worked on as phab:T96302, and to more easily let individuals opt in their usertalkpages at a wiki that has consensus for doing so, is being worked on as phab:T98270.
Thank you for your detailed insight and the pointers. I guess I will sit tight. Luckily my user talk already went Flow. :)