I have an Alexa in my Living Room and a small dot in my bedroom. Brilliant little gadgets. Always amazed as how people seem to want to believe silly scare stories about new home technology. Bet people back in 1920's worried about their old wireless;s listening in on them, etc. etc.
In my Bedroom my lovely little Dot answers to the name of 'Computer' (I am a trekkie fan). Tried that for the Living Room one, but it lives under the tv, and any time I had any Star Trek episodes on, it kept switching itself on and getting it knickers in a twist, so had to be re-named.
These turn bedroom, living room and hall lights on and off upon request. So, at night, from my chair in the Living Room, can turn on my bedroom light (and lights can be dimmed or even colour changed if required). Could do more, if I were to splash out on different plugs.
I use them to listen to the radio, get outside temperature, receive notifications of Amazon deliveries, and answer questions (instead of me having to go to my laptop). The one in my bedroom also acts as a brilliant alarm clock, does not have to be close to the bed as it responds to verbal commands. Also have headphones set to Alexa for playing to me my Audible books.
In the event of an emergency or if I had a fall, I could just call out to alexa or computer to telephone either for ambulance or else to my daughter or son-in-law.
With that and my mobile phone, I can turn on my lights from downstairs before I enter the building so no need to enter a dark flat. My daughter uses hers to turn on her electric blanket from her car on her way home from work.
They are pretty cheap to buy and a have no on-going cost (except of course a small amount of leccie).
Yes, of course I could live without it, but that applies to many gadgets that are there and make my life easier and more confortable.