I can echo (no pun intended) this experience with the Echo Show, but I would love something much bigger and higher-def. My family is separated long-distance, and I would pay big money for a higher-def "window to another home" product.
Facebook has a 15.6" version of this called Portal Plus. I can't speak to the quality/value of it.
We tried Portal Plus at work to bring our two remote workers closer to the local office but it never really caught on in the office setting. The quality and tech was quite good though. Fb login required of course which was a minor nuisance.
It looks really nice, but I'd really like a larger one that supports drop-in. Being able to just show up without having to deal with an elderly relative trying to find a button to answer is really a killer feature.
Can't one facetime on an appleTV/macMini with a webcam? Or use an ipad Pro?