Not so. I've used the kind you're talking about -- said so, even -- and this is more flexible and faster.The length of charge and the delay of starting the charge is highly variable, I think it would be safe bet that I could plug in my battery set the timer and completely forget about it faster than you get a response from Alexa.
If you are using Alexa and it's that slow for you, I'd wonder about your internet connection. Good modems are available inexpensively, and my internet provider recently upgraded us to 100mbps at no extra charge. Worth thinking about.