I came here to disagree with you, but in thinking a little about it, I'm not sure I do.
I find the lack of ports and upgradability extremely problematic. And while I understand they're supposed to be light, slim, quality laptops, the price point feels high even so.
But, these are personal gripes with the device. And nothing to do with Linux. But these are basically the same things Apple aims for and people seem to love that.
So, I might argue the price doesn't make it reasonable for the average user. But otherwise the more devices with Linux pre-installed, the better.