Thanks to everyone who responded. Obviously not a nice topic, and I of course wish only the best for @omz.
I have got into Pythonista rather heavily almost instantly. It is a wonderful application, and shows how amazing individual developers can be. I’ve also found Editorial to be great for just cracking on writing things without distraction.
Given the dependency on one person, I don’t feel I can recommend it generally for my clients, sadly, just in case. Even were the author to make arrangements for the code to be released should he become unavailable, I doubt the obvious quality and cohesion demonstrated in the product would be sustained by other developers if they had not already been brought inside to support maintenance and development.
I do hope both omz and Pythonista have a long and happy life.
No doubt there is a beta available somewhere which supports the latest version of Python. I look forward to seeing that in due course.