I don’t think it was the point of your post necessarily, but I did want to mention a couple of things that might make the Linux switch a little easier - if not for you, anybody else reading and agreeing.
First, distrobox (https://github.com/89luca89/distrobox) is a nifty frontend for podman/docker that I think makes it a little more usable/accessible without having a PhD in devops. Basically helper scripts that create a series of simple CLI commands that let you launch a new environment, enter the new (or old) environment, do stuff in the environment, exit the environment. Keeps your core system’s python separated from your development environment(s). Sacrifices the isolation qualities of containers in favor of usability, so probably ok for dev work on a desktop and not so much for production on a server.
Also, there are GUI applications for point and click management of distrobox - I use BoxBuddy, which is available as a Flatpak on Flathub, so again no interference with the core system provided it can run podman and flatpak.
Second, I know the php dev world figured out ways to abstract some docker complexity away with stuff like ddev (https://github.com/ddev/ddev) and lando (https://github.com/lando/lando). I wonder whether other languages have or will build that dev environment in a box abstraction on Docker/Podman/whatever.
I use xmpp. It happens to be a great fit for a private family messaging service. Good interoperability between modern clients. I get that “nobody uses it” is hyperbole, but the internet is a big place and there is room for services without mass market appeal to thrive.