What word would you use to differentiate design and non-design functionality?

I think the terms are usability Vs usefulness.

UX vs UI?

If one says "Good design is part of the functionality", one can also say "Interface is part of the experience".

"can I do something [at all]" vs "how [easy] can I do something"

vs “can I even determine whether or not I can do something”

Business logic

I think anyone who differentiates between design and functionality has a profound misconception of what design should mean, and are the kind of people who produce terrible interfaces because they just see design as prettifying the functionality. That's why you get buttons that don't look clickable, lines where they're not needed, no lines where they are etc. Good design is a holistic practice, and in the case of apps the interface should be an integral part of the functionality. There's lots of literature out there about things like affordances, but many people don't know about it or don't care enough to use it in practice.

design is for people who can't code

Programming is design. Good code requires design sense.

In the literal sense, yes. But in this context it's obvious we are talking about UI/UX design. I am using the exact same terminology in the exact same manner as the person I replied to. So you either have poor reading comprehension or are being purposefully obtuse. Which is it? To be clear, if it is actually the former then you have my sympathy and I hope I cleared this up.

I personally think that software design skills naturally lend themselves to good UX and aesthetic design skills and you can infer one from the other. It's fine if you disagree and I should've said it less objectively

There is not even an overlap between those skills. That's why companies employ graphic designers and not just developers.

Design is design. Those who can’t think about design fail at both code and IA / UX / UI, and often become quite rude out of frustration.

Ur angry over nothing. Weakling nerd get a life.

its a lot easier to train people to code than it is to teach them good design.

Now, now, both jobs are equally redundant now we have thinking machines..

code is for people who can't design

yes i would agree. nothing wrong with either one of those things, but if we are talking about open source you can't be mad the coder sucks at designing.

I'm talking specifically about the app SyncThing, though. I use it and rely on it, and I haven't opened it in over a month. It works as a background service.

Good design would do absolutely nothing for me.