My personal pet peeve with iPads as productivity devices is how walled-off apps are from each other and how hard it is to import content from one to the other. As an example, I have a huge (500MB ish) high-resolution video in the On My iPad section in Files. Because no option is given in the share dialog, I cannot play the video in Photos, even though both applications support the same file format.

I’m afraid that Apple will be making the Mac more like iOS with any new kind of convergence, not the other way around. We’ve seen this with the directly ported News app on macOS Mojave. Until iOS supports the beginning-to-end software development cycle (no, Swift Playgrounds doesn’t count), they’ll keep the Mac around, but it’s obvious that the “Pro” userbase is no longer of much significance to Apple. Content creators who use Macs produce much less revenue for Apple than the hordes of people who buy new iPhones every year or two.

Edit: they’re called Marzipan apps: https://news.ycombinator.com/item?id=19207757