They are gimmicks to be honest, I don't use Google Assistant and disabled their Gemini , Tell a lie I have used Assitant a couple of times when I have heard some music and got it to recognise it, but not done that for months.I can't remember ever using Siri. I've had iPhones since 2008, it was always a gimmick.
I have a load of Echo units in the house, just a gimmick most of the time, useful for music and for turning lights on and off.
I had a muck around with Siri on my Mac when I first had it, but no microphone permanently plugged in, so had to use keyboard, disabled now, and the AI stuff.