"I can't wait to rsync my files on my new tablet!" -- Nobody
Just because you don't use a niche feature doesn't mean others don't.
There's a saying in photography how everyone only uses 80% of their DSLR's capability, but it's a different 80% for everyone.
You and I might use a niche feature like rsync, but the people that constantly complain that company X didn't include niche feature Y in product Z is, frankly, ridiculous.
That is, it's not this particular niche. It's the enabling of the existence of such niches in the first place.
Nobody in the population is average (this mythical "general population"). Everyone is odd in their own way. A product narrowly targeted at the average will lose to something more open. I believe this to be an almost natural law, like how free markets are better than the planned alternatives.
Maybe you're right, maybe 'open' will win. But if it does, I'm fairly certain it won't be your definition of 'open'. At the very least, it's not the case right now. The most successful systems/devices are most certainly not 'open' and are trending towards being 'less open' aka designed for that 'general population' that you so actively deny exists.
Thanks for explaining that rsync isn't an Android feature. That explains why I've been using it for the last decade on Linux and FreeBSD.
This is why I said it wasn't a feature; what you wrote implied it was. Stock Android has no rsync. It doesn't even have cp.
More importantly, I was trying to describe the structural strategic advantage I think Android has which will lead to it winning out in the longer term, in a similar way to how the PC beat the Mac.