It’s always been the case that running it on Linux wouldn’t be a slam-dunk because AIR for Linux hasn’t been updated since 2011. For that reason, nowhere along the line has anyone promised that Linux would definitely happen. I believe that mmd’s findings in https://github.com/systemed/potlatch3/issues/2 show that it will be possible without Wine, most realistically with some container-like solution, but it needs someone who’s pretty skilled in Linux administration to establish that.

That someone certainly isn’t me, but I’m willing to give as much assistance as I can, compile special versions of P3, and so on. For what it’s worth, the two blockers are absolutely on the Adobe side and not on the P3 side: the first is that it’s just plain hard to install on modern systems, the second is that it turns out AIR doesn’t support TLS 1.1/1.2 and therefore has difficulty connecting to many modern https servers. Neither of those are things I can fix in the P3 codebase though I wish I could!