This is super interesting. Took me until nearly the end, when he started talking about how he wouldn't last as a professional software engineer, to find out he isn't one.
Great way of looking at programming. It really is just another way to create, akin to drawing or writing, and it feels as if we almost desecrate it by treating it the way we do. Inspiring article.
Why would you want to combine it all into one app? Having seperate apps for those things (maybe besides having calendar and email together) sounds proper to me. Seems odd to put it all together into one.
Proper so that people who only want to use part of it don't have to use all of it. But if your user base is one person then why not go seamless? If you dislike that part of the app, just delete it.
I haven't used this font but looking at it closely, I can't find anything that I don't like. If that extends to its kerning etc, then I wholly approve. Much like Helvetica, it's not about what it has but what it doesn't have that makes it good. I would compare it to a comfort food, which may not seem so special on-paper, but that you never tire of and am always up to have.
I see that appeal of it for sure. To my eye though, there seems to be many fonts in the same category, which doesn't make this any special really. But I suppose you might be seeing something in it that makes it perfectly comfortable for you.
I don't really like using "comfortable" fonts much. I find most fonts try too hard to be pixel perfect, removing "imperfections" that can otherwise humanize a font.