Connected straight to your smartphone without a server in the middle or not connected to the internet at all. E.g. make your bathtub automatically fill up with water at your preferred temperature on a specified time every day and then maintain that for x amount of time. Flush it automatically after that time if you haven't pressed a button manually. I could see coming home after work and jumping straight to the bath being convenient and this setup doesn't even need connectivity.
Maybe some stuff could connect with each other only via LAN. E.g. night/day sensors that will turn the outside lights on when there isn't enough sunlight. Or a monitoring panel( basically a tablet) that will tell you if your fridge is struggling to keep the temperature down( maybe the underside needs cleaning). That could also be used to create various profiles for your smart lightbulbs so you can get the exact type of light that you want. Slowly increasing in luminosity to wake you up or getting a red led-like light profile for when you want to watch a movie. Maybe a more blue oriented light to help suppress melatonin when you have to stay late. A coffee maker( using regular grounded coffee, not capsules) will notify you when the internal coffee storage is low. I hate it when I run out of coffee without realizing it and I have to leave the house early in the morning without any caffeine.
The possibilities are there but those that make these devices need to look and listen to how people actually live instead of just trying to impress with useless and dangerous gimmicks or try to get extra money by extracting data.
I find all of the seeming incoveniences are often interaction points, chances to bump with the world around us. Ran out of coffee? ... hmm, dig out an old stash of tea (it may even taste better), or stop by a coffee house, maybe meet a love of your life, or just live a 'different' day.
On the other hand, commute/traffic jam is indeed life-wasting -- it would even upset the smart bath-tub.
Notice that e.g. on the coffee example I specifically didn't suggest ordering coffee automatically for you or something. I buy fresh grinded(is that the right word?) coffee myself that I buy from a local coffee shop so all I would want is a reminder-maybe a specific text file where I input the stuff that I need to buy and the coffee machine adds coffee on it automatically. Then I can sync that file to my phone when I go shopping( maybe a couple of QR codes?).
Anyway the point of home IOT for me would be to get ease the mental load of keeping up with the house and maybe save some time with e.g. the bath tub( maybe if you decide to connect the system to your smartphone with e.g. a key exchange via lan you could tell the bath tub to extend the time that it keeps the water ready).