And for Apple, it just so happens that the market segment that likes touch-driven UI as their primary interface is as large or larger than those who like keyboard/mouse. Making mobile devices the computer for the masses widens the divide between users and developers.
It took a bit to click for me, but I understand now that the mobile/touch approach serves a segment of the population with different approaches to computational needs. It doesn’t mean it’s a superior approach, even if it sold more devices; it’s just another approach. You can argue that it isn’t the case until you’re blue in the face, because “underneath it’s all the same”, but it’s the reality. It’s like saying a Ferrari and a Fiat 500 both have engines and gearbox, so they serve the same transportation needs and you can determine an objectively superior car - it’s false and you can’t. Doing the weekly grocery shopping with a Ferrari is as hellish as trying to race with a 500.
Computational devices will become more different in shape and uses, not less. Convergence is a production-driven myth that will never fully materialize. We never really reached convergence even when the operational modes were just two (desktop and server), it certainly won’t happen now that you can put computers in glasses and watches.