I don't think it's beyond the call of duty to expect someone to acquire context beyond their immediate assignments, especially if they have ambitions to advance. It's kind of a key prerequisite to the kind of bigger-picture thinking that says "hey I noticed my component is duplicating some functionality that's over there, maybe there's an opportunity to harmonize these, etc"

When presenting the three projects, I gave pros and cons about each one, like "you'll get to learn this new piece of technology" or "a lot of people will be happy if we can get this working". Absolutely no reaction, just "I don't care, pick one".

This guy claimed to want to get promoted to Senior, but didn't do anything Senior-shaped. If you're going to own a component of a system, I should be able to ask you intelligent questions about how you might evolve it, and you should be able to tell me why someone cares about it.