Smart TVs mostly exist to subsidize the cost of the hardware though licensing deals. We use none of the features that came with our Smart TV, and stream through an Apple TV instead. If your Smart TV gets deprecated, you can always upgrade to whatever the latest streaming device is, and plug 'er in.

I do say that I very much like our smart clothes washer's app and find it useful. It sends me a notification when the washing cycle is complete so that I know it is time to move it to the dryer, enabling a more efficient wash day, and less likelihood of forgetting a load in the washer and having it mildew.

I also do like my wifi connected light switches quite a lot. I frequently find myself wanting to dim the lights after we have already sat down to watch a movie or something. I don't want to kick the cat off my lap just to adjust the lighting. And I use it every night when going to bed, as the light switch is on the opposite side of the room, and our bedroom is completely pitch black with the lights out due to my war on LED indicators. We also travel frequently and have a preprogrammed "away" lighting schedule to make the house look occupied. Smart lighting is a super useful upgrade.