Hard disagree on the first two, a maybe on the kitchen appliances.

Smartwatches are awesome. I can read a notification without getting my phone. Activity tracking. Sleep analysis. Payments. Music. GPS. Phone calls. Messages. All for under 200 euros new (I just upgraded to a refurbished Samsung Classic 6 this week for 110 euros including shipping). A basic Chinese one with a a bit fewer functions can be found for 20.

Smart Lightbulbs have allowed my family to not touch a light switch for the last 5 years. Every room turns the lights on based on presence, time of day, day of the week, air quality or status of the garbage bins or what's playing on the TV. Took a few weeks to get it dialed in to the preferences of everyone and has been running reliably since then. Bright white during the day (where needed), cozy warm dim in the evening, red in the middle of the night when you go to the bathroom, unicorn vomit for the kids birthday party. They are like 10 euros a piece, I don't have dumb Lightbulbs anywhere. Led strips add for fun effects like sunrise, aurora or fire.

Kitchen appliances are a bit more convenient. I can start the dishwasher when there's excess solar, preheat the oven when heading home with frozen pizzas or blink the whole house lights blue if someone left the fridge open. Definitely nice to have, probably not life changing. Fridges with screens and AI and shit, or anything that REQUIRES an app... yeah, pass.