Good to hear alexa has gained the casting abilities, I have both but I have used google primary for the last 6 months. We initially went the google route for voice control of video content but also because it was already embedded into our phones. Although I will say I am disappointed in the lack of voice control of netlfix on the Shield TV.
As far as notifications go you can hack your way there with google home using cast-api [RELEASE] cast-web 0.1 - Chromecast Device Handler & SmartApps With google minis on sale for less than $30 it encouraged me to try it out and so far I am impressed.
Is there any way to automate casting content with alexa/fire TV like you can with tasker/autocast or the tasker/auto intent workaround that I posted above? I’m beginning to feel like an automation addict I finally have voice control but now I want more… I dont think I’ll be happy until I get mind control 