Yes, but saving it locally is the hard/unergonomic part.

There's the great SingleFile extension, but it doesn't always work, and it's a bit of a pain to do on mobile compared to just sending a page off to a reading app via the share sheet on iOS.

"unergonomic" exactly! But that's the same for an mp3 podcast episode! You can't easily save one on a mobile to auto-sync with your other computers and also allow highighting/tagging/syncing playback position/favorites.

Ergonomic is precisely the core value proposition of all these services, "dumb" save has been possible for any such content since forever.