Bicycles are an odd duck where this is concerned -- you go to a department store (no, actually don't) or a bike shop and buy a whole bike as a single assembly. But because there are standards, as others have pointed out re: computers, it's very feasible to just buy all the parts individually and piece together the bike that you want (which is what I do). Honestly, working in a hot (or cold, it is Minnesota, after all) garage, sometimes I question my sanity when I'm assembling these things...but the ability to fine-tune what you want and not be beholden to the standards of some marketing department or the cost-cutting assholes that run private equity funds is quite nice.

Ultimately, I'd love it if there were enough standards out there where I could spec out a car, and have it built up from parts...or just buy a stock one, if that's what I wanted. I feel that way about a lot of products that I interact with -- appliances usually have shitty UX, car software is usually garbage, and I'd love it if I didn't have to rely on DJI for a drone (good luck getting them in the U.S. anymore, anyway).

I think that with any product there's a subset of people who are like, "Eh, good enough," and willing to buy whatever the big manufacturers are pushing, but there's a smaller subset that wants to really dial-in something that fits their needs.