That doesn’t sound any different than most similar electronic devices.
Yes it does... Phones for example, come out with a known date for end of updates/support
Now putting all this aside, why on earth would any of you be simping for Amazon here is beyond me. Literally, if they do not commit to some reasonable support time, they could pull the plug on ANY device at ANY time for ANY reason
For example, if Amazon decides to sell you a very expensive Amazon TV, you buy it and after 6 months Amazon pulls the plug on it because sales were not as good as they expected, you would be left with a brick... and you are here defending this practice