After over a decade of people jumping into these discussions with this line, I’ve gotta push back: Design is also how things look, and how things look can be important.
Consumers care about how things look. If we dismiss presentation and drive people towards UX stuff every time it comes up, then the people we talk to are going to end up having good ideas that no one buys because the packaging is a mess.
Yes: If you have a pretty modal but it can’t be dismissed by clicking outside of it, that’s Bad Design. But when you’ve hammered in all those errant nails and built something that works well, often you look at it and go “I wish it weren’t so ugly”. And we do need books/resources to give people the building blocks they need to make an app that people will agree is “basically good-looking”. (And then hopefully more advanced books/resources about particular styles so people can develop their own stylistic voice)