What if, hear me out, the wheels were on the sides and not front and back. It uses gyroscopes to keep itself balanced. Instead of twisting the handle or pushing a button like a savage you lean in the direction you want to go! This is a totally new idea and not a product that was released over 20 years ago and since discontinued.
I'm pointing out, as others have, that the bike market is highly fragmented, lots of variety for good reason. It would be hard to come put with "a" , or even "a line" of bikes. You really need a dozen
My long-standing hobbyhorse is that Apple should buy Brompton.
Miniaturisation? Check. Lightweight metals? Check. Battery technology? Check. Premium design-centric product? Check. Product small enough to be sold through worldwide network of Apple Stores? Check.
Then add in what Apple could do with UX around bike navigation and you have a perfect fit.
There was a gyroscope based motorcycle which I thought was more the Apple Style. I was imagining single person cars just like they make all their devices single user. Get one auto-driving bike for each member of the family and you would ride laying on your back so you could take a nap if you wanted.