>>1750150lots of people have windows in their pc cases to show off components and neat cabling
likewise with cars, hoods, interior trim, etc, serve functions, but race cars or faux- race cars will often have far more things exposed, and people who put effort into tidy engine bays will put their hood up and show it off.
pcbs just aren't really that cool but when they were clear cases for stuff was a thing
this isn't exactly true for bicycles, but your general logic 'hiding something is better just more effort', that's not really generally true. Having something exposed requires it to be neat and aesthetic.
