I personally haven't owned a computer in about 5 years, only an iPhone. But if I were to ever get one, and it came down to a Mac or an iPad, me not being able to get an app on the Mac that I currently use on my iPhone would certainly sway the decision. I agree that it's not about the total number of apps. It's about making sure I can do everything on my Mac that I can do on the iPhone. As you said, I probably have about 20 apps I use the most, and right now a number of them are not on Mac, including the one I just used (to run my Joule sous vide).