I work closely with design and I am consistently saddened by the state of the tech industry when design discussions pop up on HN. They almost always devolve into a cesspool of blanket criticism and rejection. "Those designers..." an HN commenter will inevitably say, "...all they care about is making things look pretty." Well, sure. Yes.
The facts are plain, and actually boring. Customers like pretty products. Well-designed experiences and objects, compared to purely utilitarian products of similar functional capabilities, will always sell better. They create more passionate users and make more money. This is understood by businesses across the world, almost forever. To read an HN thread on design with no previous convictions is to see a world where designers are scam artists and their contributions to the tech industry nothing but snake oil.
Of course there is excess. That's also obvious. Tarsnap and Pinboard are HN darlings and they clearly place all their emphasis on functional design rather than visual design, and are very successful businesses. Craigslist as well is one of these types of businesses. But these companies do not appeal to average consumers. Pinboard doesn't compete with Pinterest for users – nor could it ever, nor does it wish to. Would I, as a proponent for modern design sensibilities, argue that Craigslist doesn't have good design? No! They have fantastic design... for them. It suits their brand. Would Netflix be functional if it had a "Web 1.0" Craigslist-style interface? Yes! But people would hate it. It wouldn't suit Netflix. It would look terrible in a living room on a TV, for one, but Netflix is a platform for cinematic experiences and the branding and interface should allow designers the kind of control that let's them create a suitably cinematic interface – however they wish to do that. Craigslist works, by comparison, because it is essentially a glorified newsletter (hot take!).
The price of a custom typeface, depending on who you commission to make it, can probably range between $100,000 and $500,000 or something like that. For a mature business like Airbnb or Netflix or Google this is not an investment in efficiency or in growth. This probably makes the HN reader's head explode. It is an exercise in fashion and style and distinction. There is a reason that the console-dwelling set is often stereotyped as the guy in poorly-fitting jeans and neon sneakers and a hoodie with a shark high-fiving a sasquatch on the front... they often don't waste time on considering things like fashion or style or distinction.
One mentor told me that "Design is anything that makes people more successful". Sometimes this is making one button red and one button green, for example. Sometimes it is about aligning critical actions to the edges of the experience, a la Fitts' Law. But I think this is a narrow understanding of what design can be. Design is also about creating a visual atmosphere, a well-defined world for the narrative of a product to become more than it's functions.
Software is allowed to have an emotional quality to it, it is good to delight users with little illustrations and round buttons. An interface should have feeling, and mood, and a vibe to it. Personality and soul is always, at some level, designed – visually and functionally in equally significant parts.