And this is where we differ, I would never advocate putting OS X on an iPad since the form factor and kludging of add on keyboard technology is not great. OS X user interface and all the applications written on it are not developed with the user interface of touch being part of the equation and snapping it on after the fact just becomes annoying for a general computer user (controls too small, not organizing information to allow for bigger buttons for fat fingers, drop downs). Different device, different use case. One device does not suit every need perfectly and trying to force it only alienates people more than anything else. This is why forcing Windows 8.1 as the answer to everything on people that used their computers for productivity was widely rejected by most existing users and they refused to upgrade. It is also why businesses widely rejected any move and will stay with Windows 7, because it better meets their use case.
Businesses would have stayed with XP if MS didn't EOL it, it's more of an issue with cost than anything and the fact that superficially windows 8 really didn't offer much over windows 7 for desktop users. Windows 8.1 didn't have any desktop issues beyond the start button/menu IMO, I think the media just likes something to pounce on. The only tangible difference in win 8.1 was the start menu/button which was what 99% of complainers complained about, and I agree with them. A simple 3 minutes downloading and installing the free Classic Shell solves that issue 100%. This isn't an excuse for Microsoft mangling the start button and decreasing desktop functionality though.
We definitely think differently, but that's ok

we are just discussing viewpoints. I could never see carrying around a laptop and an iPad, then getting home and having yet another desktop there, and getting to work and having another desktop to connect to. I really like this new paradigm where I only have one device to rule them all. Windows 10 has continuum which switches you from tablet to desktop use intelligently, for example it will switch the size of taskbar buttons and such on the fly. Obviously a work in progress, but at least someone is advancing this.
The iPad was great for it's time, it was phenomenal and I'll remember it with fond memories. I'll also remember my Sony Walkman and corded telephone fondly, but there is no reason to limit myself anymore when better solutions have arrived.
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We sort of agree on this..... but I view it as most people fall into an either / or but not both category depending on use case for the device. Most people will have an (smartphone AND a laptop) OR (smartphone AND a tablet) but not (smartphone AND laptop AND tablet). If my primary usage of a device is consumption then I would likely just have a tablet (slimmest lightest that meets my needs). I know plenty of people that just have a large phone because that is all they need. If my primary usage is actually doing work I want a solid laptop that does not feel like unbalanced and the keyboard an afterthought.... If I have a full laptop, I will rely on my phone for any tablet functionality of consumption.
But that's not what the research says. A very high percentage (like almost all) of iPad owners also have a laptop. I assume the vast majority of them also have a phone, with a high percentage of that being a smartphone.
Now to your point about having the slimmest/lightest why not the surface 3? It's almost as thin and light as the iPad air, and the larger screen explains the small difference in volume.
It's all good though, I think we are just nitpicking at each of our ways of using our devices, but we are not clones of each other. It's an interesting discussion and boils down to whether consumers act more like you, or me, or somewhere in between. I'm curious as to how surface 3 sales do as they have a humongous mountain to climb versus Apple.