> Mainstream bicycles are brutalist: The chain and gears are usually on display and user-serviceable. Parts like wheels, saddles, and handlebars are standardized in a way that allows users to mix and match components freely

That's a matter of perspective. If I create a simple bike drawing in crayon, it has none of those things, but everyone knows what the drawing represents if they had it. Maintenance and extensibility concerns are incidental. Framing things to be attractive, was one of SJ's talents.