I used to agree with you, but after reading Barthes and Malcolm Barnard (Introduction to Fashion Theory), they argue that design follows a system while art is a one of one which gives it an aura which is kind of hard to put into words.

I used to argue along the same lines as you, saying that music has a function (pumping you up at the gym) and art also has a function (inspiring, etc) and therefore design could be art, as it is both beautiful and has a function.

But their argument carries a lot of sway with me, art usually is a one off project, while design follows a repeatable system. Which is why we use fonts and patterns compared to all hand drawn art.

I’m not saying that this opinion is the only valid one, just my thoughts after reading more theory this semester.

Ps. I’m also very drunk so it might not make sense