But they don't do that for iPhone, iPad, MAC OS, IOS, etc
Wish they spent that much attention on IOS.
There is a big difference in how much research should/could go into an entirely new product type, than updates to an existing product. Unless you are proposing that Apple should not update their iOS on an annual basis (since you seem to be suggesting that they should put two years of research into that as well).
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This is why IOS and MAC OS suffer. All these people focussed on this nonsense. Get back to work and fix what's broke.
Good to know that you consider the watch nonsense. Unfortunately, someone else chimed in before you, and called iOS nonsense, so Apple already chose to accept their arbitrary opinion and give up on it.