Yeah Spotify has forced that kind of change, one of my older avrs no longer works for Spotify, one other was upgraded by firmware to Spotify Connect. Didn't know Pandora was doing it similarly, all my older devices with Pandora are still functioning....for now.
ps Spotify connect is far less clunky than the avr's Spotify app was, too. I can also just use the Spotify app on my computer as well as my phone.