This entire post is super funny. You do realize there are several smartwatches that have GPS built in already. There are also smartwatches that have both GPS and cellular connectivity. Tech not ready for another 3 years? Come on man.
That bolded part is... absolutely incredible. Buy a watch and then some screens.How is carrying dumb screens any different than carrying a, oh I don't know... a phone?
Those watches that have GPS/Cell radio are either SUPER HUGE or have crappy displays compared to the AppleWatch. Bottom line is the tech isn't ready to jam a GPS/Cell Radio into the current Apple Watch case and get the same battery life. The case either needs to get much bigger or battery life will suffer. A bigger battery would be needed to run a GPS/Cell radio.
Why would you want to carry a dumb screen? The whole purpose is you have a choice. A stand alone Watch with LTE would not need a screen. But if you needed a screen you could carry one. Plus you could buy two sizes of screens. Say a 4 inch and 6 inch. You choose what screen you want to bring on which day. Plus these screens would be much lighter and much thinner than a phone because they won't have all the internals of a smartphone.
But this is only a stopgap. The real end game is for the watch to have a holographic display so no physical screen is needed. But that is a good 10 year away.
Its all about having vision. If you can't see that the market will be switching from smartphone to wearable as the primary personal computing device then I can't help you. But it is going to happen within the next 10 years.