Earlier quoted context omitted.
I'd bet 99.9% of people buying PC Laptops never upgrade a single chip... Apple's non-pro lines are likely not much different. Apple largely sacrificed that ability (in a few product lines) in favour of creating some of the thinnest laptops available. I don't remember them ever doing that before Macbook Air, for now reason. That said, in this case, I don't see what is being gained by not making the GPU swappable or at…
My HP laptop died, the integrated GPU died. And HP support said they do not manufacture that motherboard anymore. So what's the point of having it upgradable? Sometimes it works, other times not.
You can probably still buy one of those mobos and swap it out. Just look on ebay.