I think this article about Apple's attempt to transform the iPad into a laptop - and contrasting it to Microsoft's Surface-based attempt to transform a laptop into a tablet - is quite good.
Personally I'm a strong advocate for the hybrid device scenario, having spent the last few years entirely in Surface-land. Starting with the Surface Pro 3 (SP3) I have been quite happy with that choice. The SP1 and SP2 widescreen concept was interesting, but impractical for doing real work like editing documents or running Visual Studio. The SP3 and now SP4 screen sizes are very practical (especially the Surface Pro 4 - what a beautiful screen!!).
The idea that Apple would create some sort of hybrid was a foregone conclusion from my perspective - once I'd become hooked on using a Surface instead of an old-fashioned laptop.
When I'm sitting in a cramped airplane seat, or relaxing on the couch in front of the TV I want a tablet - one with all my stuff on it.
And when I'm trying to actually compose an email, write a document, or do some coding, I want a laptop - one with all my stuff on it.
Interestingly enough, "my stuff" is the same at all times. I want access to all my stuff whenever and wherever I am.
I use OneDrive to store all my documents, music, photos, etc. All my files are on my desktop, Surface, and in the cloud – so they are available anywhere and everywhere. And that would be true on a Mac and iPad too (though probably not offline on the iPad, so not accessible on an airplane?).
Another big reason my stuff is always available is because of the way Windows 10 roams everything - all my app/browser/desktop settings sync across my devices. And that could maybe be done between a Mac and iPad I would guess - with some effort to address the mismatch between Mac and iPad apps that do similar things, but aren’t the same apps.
But on Windows 10 I am using the same apps on my desktop and Surface (and often my phone). So there's no mismatch, they are literally the same.
Maybe not everyone values this consistency like I do - but I want my same browser with my same favorites/shortcuts/etc. on every device I use. And I want my news reader (NextGen Reader) and Reddit (Readit) and weather and twitter (Tweetium) and Facebook apps to know what I've done and what I like without having to tell every device the same stuff over and over.
So yeah, I'm a big fan of the hybrid model - and I hope Apple is reasonably successful at it, if for no other reason that competition will drive Microsoft to keep making Win10 and Surface better and better so I love it more and more :)