What was the stated reason?
> Recently, meaning the last 5 years or so, I have become more and more depressed...
> (laughter)
> And what Apple is doing to something that should allow you to work is just atrocious.
> But they are taking a lot of space and time to do it, so it's okay.
> And I have come, in the last month or two, to say even though I've invested a zillion years in Apple, I'm throwing it away.
> And I'm going to Linux, to Raspbian in particular
> (applause)
> Anyway, I'm half transitioned now.
Raspberry Pi hardware would be the obvious constraint. Though, that only pushes the question one step further: Why a Raspberry Pi hardware? I... don't know. If you went from Apple devices, it seems like a non-sequitur. There are much, much better options, unless on an extremely limited budget.
But, I also don't know his use case. Does he have a gazillion of them for some (I assume interesting) reason?