Agreed, in fact the Yoga Tab can be picked up for quite a bit less than that now and doesn't have the bugs. I bought the Yoga some time ago, with no interest whatsoever in the projector, but it's actually really good at least for indoor use (maybe not so much outdoors).
But as for the "Amazon Echo and Google Home – even iPads – producing really quite impressive sound" - seriously? I'm no audiophile (couldn't afford to be if I wanted to anyway) but my idea of quite impressive sound is a little more expensive than that. I don't rate the Google Home at all for sound quality, and even that's supposed to be better than the Echo.