Alexa and AIs
I disagree about Alexa and other so-called AIs (Siri, Cortana, whatever the Google one is called this week). They're about as smart as a 1980s text-adventure game:
"Alexa, where did I leave my glasses?"
"Bilbo heads north and is eaten by a troll."
Maybe in a few years they'll be better. But today I can't just say "Alexa, when is the next train to Barnsley?"; instead I have to say "Alexa, Launch National Rail app, go to Live Departures, go to my home station, query next departure to Barnsley"; and then it has the cheek to ask "Did you mean Barnstaple?". I exaggerate, but not by much.
These things are worse than mere toys. At least toys are fun for five minutes before getting bored of them. AIs are frustrating for several hours, before you go back to turning the lights off with a flick of the switch.