Because you are the target, people who like nice looking hip things and can afford it. That device doesn't do much, doesn't sound particularly good, and certainly is sold to you at a premium. No wonder these products are sold at the MOMA...
First, we're not talking about hardware in general but that TE device precisely and second "it sounds good" is really a matter of taste here, the synth engine is very limited and the first version didn't sound really good given its price. This is absolutely a hipster device, just like all TE products.
https://teenage.engineering/products/ob-4 650€ for a freaking radio?
Don't make it about hardware vs software, this red herring has nothing to do with my comment.