I think nobody demanded anything of that sort, that is just a strawman. What was actually demanded is that priority of such bugs be raised, and perhaps users be adequately warned about known defects that may compromise the confidentiality of their messages.
That Signal developers didn't have an idea what was going on for 6 months? And then it turned out to be similar to that other stale/invalid database bug where messages were sent to unintended recipients? Back then fixing only the bug at hand but not taking steps to ensure that the type of bug (wrongly matching expired message IDs to existing messages) won't happen again? Doesn't paint them in the best light.
> to throw around labels like "proprietary" just because they don't release something on your schedule
I throw around the label "proprietary" because software which doesn't come with source code is in fact, proprietary. If Signal pushes new server code to production and keep its source to themselves, calling that still "open source" requires serious mental gymnastics.
> Signal, for whatever reason, seems to attract a lot of entitled complaints like the ones I enumerated.
No, besides your strawman the other commenters were all reasonable and constructive.