Alexa seems to be for people who:
1. Can't be bothered to turn lights etc on & off by themselves. Instead, spend dosh on a box of tricks to do it for you.
2. Can't be bothered to decide on which music to listen to, let alone put a CD (sooo 20th century!!) on.
3. Can't be bothered to do very much, rather ask a box to do it.
4. Like the novelty of talking to a box.
While I can see the potential it has to assist the elderly, infirm or disabled, FFS people - do you really need this thing to write a shopping list?.