The biggest advantage of EchoSistant, is the use of free text, which makes things a lot easier for the end user. Natural expressions are available from the begining with no additional set up needed. You could say Alexa is too hot in my home, and Alexa will respond by adjusting your AC. Or Alexa is too dark in the bedroom, and Alexa will respond by turning the lights on.
Also, EchoSistant offers a friendlier way of identifying Alexa enabled devices by linking them to a Profile. This enables users to send targeted messages between rooms (intercom like features).
You could find a great discussion about EchoSistant and Ask Alexa on the following thread…