Some historical context first. TaskMator is probably 90% TaskPaper for iOS that Jesse shelved and made the source free for others to carry on a couple(?) years ago. I just reinstalled TP on my iPad from purchased apps to have another comparison. While the TaskMator developers have made some respectable enhancements here and there I agree, it's finicky as all heck to manage. If someone was to take on building a new iOS app you'd want to scrap that UI and look to the recent Mac codebase for excellent inspiration.
I've used Editorial on and off for over 3 years now and it's a malleable beast that can be as simple or complex as you wish. The foundational TP support is there, but the enhancements by user Workflows take it even further. You would be looking for one such as this to achieve Project Focusing. Browse around that repository to see all else that is possible, besides writing Workflows yourself! And you can add your own custom keyboard shortcuts as well: I have CMD+D assigned to @done and CMD+SHIFT+A to Archive.
Of course the historical lack of updates, in a sort of binge and purge fashion, is the most troubling. The last official update was 1.5 years ago, and the only one before that was after 1 year!! And for free. I would have gladly paid the measly $5 he charged for it again to keep it alive. I have the utmost respect for Ole's talents—both Pythonista and Editorial continue to be groundbreaking iOS-limit defying apps. But this lack of updates (or even forthcoming communication about it) has left many begrudgingly running to other options. (I've long since moved my Markdown writing to 1Writer and now predominantly Ulysses since it's solid Dropbox folder support).
Ole has freely admitted that Pythonista is his predominant focus and source of income. Editorial shares some of that codebase then goes off in the text editor tangent that it is. The only usable way to currently run it on iOS10 and an iPad Pro is to ask Ole for a TestFlight access to the more recent beta. But if you find it intriguing like I still do, please both buy it and express your concerns about it getting an update soon.