Syncthing may not have its own Web-based file browser but a regular Web server (like Apache or ngninx) can show a list of files in a directory without much configuration. Just point it at a shared folder. You could configure a fancier file browser like Filestash, File Browser Quantum, or even Nextcloud if you feel it’s worthwhile.

Likewise, Syncthing may not have its own concept of a “main” hoster, but it doesn’t need to: you can decide what “main” means to you. Perhaps the one you designate “main” has different ignore patterns, or a longer retention policy.

“Keeping some files remote” can be simply making sure your ignore patterns are set how you want them, if that works for you.

How often do you “catch” a delusion, and how does it feel once you notice?

Like, do you find yourself saying something like: “hold on, that person probably doesn’t actually want to harm me… that’s one of those delusions isn’t it?”

Just as easily from every angle? No slowdown at all, even for mirrored text?

That’s pretty cool, even if it is mostly useless.