I think there’s a fair point in here, but I also think that catering to power users is a mistake right now. If they do that (assuming Amazon even could do that, which you could argue Google is far better positioned to do such things, of course), Echo runs the risk of remaining a more niche product.
I also think there’s something to the notion of starting small and simple. It’s true that the Echo can’t do everything you want, but it’s focused on doing what it can do well. Under-promise, over-deliver, never the other way around. Building from that base sounds easier than trying to boil the ocean.
That said, I will watch with great curiosity to see how Google’s Home product does here (as I allude to in the end of the post). As you note, a lot of this is in Google’s wheelhouse. But I still believe it needs to be a stand-alone product to truly succeed in the way they want. Which is probably why they built it!¹
¹ I, of course, am a partner at GV, which is now a sister company to Google under the Alphabet umbrella. My thoughts and my Echo are my own :)