I appreciate that, but...

> I've been working for multiple decades now with systems that have no UI to speak of; their end-users are barely aware that there's a whole system behind what they can see, and that's a good thing because they become aware of it when it causes them trouble.

Notice I said "user" not "end-user" or "customer".

This was not an accident.

In your system (as in mine) the "user" is the operator.

> the best solution to a problem is to avoid it.

That's your opinion man. I don't know if you can avoid everything (I certainly can't).

Something to consider is why Erlang people have been trying to get people to "let it crash" and just deal with that, because enumerating the solutions is sometimes easier than enumerating the problems.