Afaict phx-mounted is executed for element A before hook for element B has mounted.
So I can’t use this as a global indicator of “all hooks have mounted”.
Instead, I would have to determine if an element is within a hook, and whether that hook has already been mounted.
I reckon that’s possible, just way more fiddly than I would like. And again, probably have to instrument each hook, or at least HTML where hook is referenced, individually.
