What Apple fanboy has ever claimed marketshare as Apple's biggest asset or desire? In the U.S., iPhone marketshare is huge but still not even 50% last time I checked.
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The Watch still relies too much on the smartphone component which means Apple wouldn't be able to assure a good user experience. Look at all those cheap Android phones out there that would kill to be able to connect to an Apple Watch. Their garbage hardware, unsecured OS and malware-ridden apps would ruin the Apple Watch experience for all of those people and only make Apple look bad.
I think of market share as something tha t directly impacts the ecosystems. For example, most of the world (US is only 300M). So the less being on iOS, the less useful Animojis are, the less FaceTime is useful, and ability to send you heart beat or walkie talkie in Apple Watch. Most are useless features but you get the point