Then there's my beloved 2013 Google Glass Explorer Edition, which still works perfectly but which Google stopped supporting February 25, 2020.
https://mashable.com/article/google-glass-explorer-edition-f...
https://mashable.com/article/google-glass-explorer-edition-f...
Even with Nest specifically they dropped Works With Nest support last year, effectively killing off the many integrations that had been built since 2014 in favor of their newer Works with Google Assistant program.