I’m building a web front end that supports editing, but I still think there is a use case for read-only.

Sometimes you want to only update your todo lists at the end of the day. In my case, I have a list of places I want to travel during the day. Things don’t go 100% as planned. You go places you didn’t intend, or you didn’t get a chance to do it all because you wanted to spend more time at one place. I prefer managing my todos when I’m back at accommodations, instead of being distracted from enjoying the present, even if that’s during transit.

Not at all! My blog (two-wrongs.org) is published from Org source files. I have previously published documentation from Org sources too, with no expectation that the viewers should edit.