Based on how Apple tells us to develop the apps, you have to do anything bigger than a bread box on the phone. The obvious reason is battery life; every CPU cycle spent doing something in the watch that could be done in the phone is waste. Less waste = better battery life.

You say that like it's a bad thing. Greed is what corporations are for. Greed--and nothing else--drives businesses to provide things that their customers value.

Greed implies excess.

Who decides what's excessive?

It's a conspiracy I tell you! Or perhaps the USB plug doesn't physically fit in an iPad or older iPhone. No, it must be Apple trying to sell everyone these Windows PCs that can restore iPhones!(you never needed anything but the phone and a sim with subscription to activate it)

Mobile is the new PC. Config on the dominant platform is simplest.

Only what will android people do for their bad choices in life.

Continue to not care about apple watches, probably