I'm not sure I entirely understand the whole screen concept on something like the Echo... it feels like Amazon is just building a bulkier version of a phone. If you have a question complex enough to require imagery, why not just use a smartphone to begin with? Same with calls.
I don't have an Echo though, so there may be something useful there that I'm missing.
The same was said about iPads. Pretty much word for word.
My kids use the echos in the house to look things up (and annoy me jokingly) all the time. Text is good but sometimes visuals are even better.