If OP sees this, I really like how you are thinking about things. It's really hard to see forward. The target isn't fixed. Bell Labs, Apple, etc. were mostly solving for a fixed target. But now the target is a relationship between humans and LLMs, and the way that LLMs work has been evolving rapidly. I can think of a number of ways to conceptualize how things are moving, but they're probably all wrong. My best guesses about what needs to remain stable is that I don't think shared software is going away entirely, and I don't think all input is going to collapse to just a microphone and a camera. There is a floor on tasks that we want agents to do for us. I'd rather rename a file on my desktop or text my friend myself. Apple and Google have both tried very hard to abstract the file away from user reach, but it's such a convenient unit of sharing, that it might stick around for a while.