Amazon is taking away this Alexa feature from Echo speakers for no real reason

TL;DR Amazon has removed Alexa voice controls for AUX input on several older Echo speakers with 3.5mm ports. The physical AUX connection still works, and users can also manage supported AUX modes through the Alexa app or switch to Bluetooth. The change affects the Echo Studio (1st Gen), Echo Plus (2nd Gen), and Echo (3rd and 4th Gen).