"that entire computer is built from the same hardware" - Some of the major components are. But let's just pretend for a moment that you're right. That still isn't my point.

"the only difference is . . the OS." - Let's pretend once again that this is the case. IT'S A BIG DIFFERENCE. THAT's my point.

And to follow up on your analogy, that nifty new compass (which presumably replaces one that didn't work so well) will likely help my same sails get me to a desired destination.

I guess we'll just have to disagree.