A few weeks ago Federico Viticci wrote a very nice article about his transition to the iPad as his primary computer: A Computer for Everything: One Year of iPad Pro – MacStories
"There's no doubt in mind now: the iPad Pro is the best computer I've ever owned not only because it's powerful, but because iOS apps unlock a different kind of productivity on the big screen. More than any other iPad before, the iPad Pro is the strongest argument in favor of iOS for as a primary computing platform."
"My first year with the iPad Pro has been a success. By embracing new ways to work and manage my time, I was able to optimize my workflow on a computer that can transform into a laptop, a book, a videogame console, and a focused writing machine. I've had fun working on the iPad Pro, but, more importantly, I've accomplished more thanks to the power of modern iOS apps. What I do on the iPad Pro today can't be done on a Mac."
Serenity Caldwell has also been using the iPad as a primary computer - mostly.
The potential of the iPad platform remains huge, but Apple has made great strides in realizing some of that potential, giving its users more control over the last twelve months. Thanks to third-party apps like Workflow, I've been able to recreate — and in some cases, better — daily work tasks.
There are more and more people doing this and along with the trend there is growing concern in the Mac-using community that the Mac might be on the way out. Maybe in the distant future. Maybe not. But if so I don't see it happening anytime soon. Jason Snell has a great video about the Mac as truck, tablet as car comparison that Jobs used several years back.
At this point in time it is a given that the iOS ecosystem will only become more powerful in terms of hardware and software. From iOS to new iPads to other as yet unreleased iOS devices, we don't know where this road will lead, but we can plainly see that the platform is increasingly capable of handling a greater variety of tasks and is often capable of things the Mac is not capable of. And with the recently introduced "Pro" branding it seems Apple intends for the iPad to become more people's primary computer. With iOS 10 many iPad fans were a bit disappointed with the lack of iPad specific features. If Apple truly intends the iPad to take a more prominent role they'll have to do better.
I've greatly enjoyed my increased time on the iPad in the past year and there's no doubt that it is now my preferred device. There's something about holding this impossibly thin and light pad of glass and metal that just feels right. It feels like the future. Maybe I've watched too much Star Trek? In any case, I suspect with each year more of my work will be iPad based and less will be on the Mac. It's safe to say that the Mac is now a secondary machine but truthfully, I'm still happy to have it around. I'm beginning to think of macOS the way I used to think of Mac OS 9, the "Classic" Mac OS. Not that the old system was ever as stable or as enjoyable to use as OS X but it held a special place (and still does) in my memory of Mac experience. OS X/macOS has been an incredible workhorse for 15 years and I've made my living using it. I've enjoyed every version beginning with the public beta all the way through to today.