I’m not advocating against alternatives, I’m saying there’s no point in dropping your visibility to zero

When you say that, that's exactly what you're doing. And it is not true, either.

Nearly nobody uses RSS readers these days, people get their podcasts on other apps.

What do you mean "other apps"? Every podcast app is an "RSS reader". How do you think people listen to Spotify podcasts from the Apple podcasts app, and vise versa? You should really educate yourself more on how this works. You do not have to upload your podcast to Apple to be visible on Apple.

The RSS feed isn’t a defining feature of podcasts anymore

It is quite literally the only defining feature, other than containing audio/video media.

and many of the biggest podcasts no longer use it.

Then they're not podcasts.

Now show me a podcast with significant followership that does not host their content on Spotify, Apple or YouTube and is only available via the RSS feed.

Where they're hosted is not relevant. Every podcast with an RSS feed is available on Apple and Spotify apps. 100.0000% of them. Along with any and every other podcast app.

What doesn’t?

GOG games on Linux.

Open terminal, umu-run ~/games/some_game/some_game.exe. You can even use tab to auto complete parts of the path. Done.

LOL this is a gross oversimplification and you know it. Its not that simple and it WILL NOT WORK. I'm not playing this game anymore.