I’ve reached that point in using both a Mac and an iPad when I regularly find myself pointing at the Mac’s screen to get work done. I think that’s a turning point.
The future of the Mac
I’ve been using both Apple’s platforms side-by-side since the 2010 iPad shipped. At that time, the iPad was more like a large iPhone.
These days, productivity features like Slide Over mean I’m making much more use of iPads to replace the Mac, and in future I think we’ll find that Macs become iPad accessories.
Apple is expected to make iPads even more capable Mac replacements at WWDC 2019, when it will introduce Mac/iPad features that current speculation claims will include: