1. All these devices would sell out, because these are all of Apple's best sellers. I'm willing to bet a replacable battery iPhone will sell as much as the iPhone 6e. Replacable batteries aren't a strong feature.

2. "Current Apple Product" + "My own personal tweak" isn't a product strategy. "A convertible Macbook Air with a touch screen?" wouldn't move the needle sales wise, and would just be a headache for developers. If, for some strange reason, you need a 19inch touch screen, the iPad pro already exists and has better developer support.

Most Apple products are locally maximized. The last great new Apple product was the AirPods in 2016. Neither the Apple Watch or Apple Vision Pro seems like they will define a new product space.