2. Lot's of issues, my presence does not determine my need for coffee.
4. Sounds great but in reality you won't be able to see things hidden behind other things or if a sauce bottle is full or empty.
7. What does roomba do that I need apart from a timer?
From your list is seems like we'll have an internet of half working things that everyone turns off after a week because they're more trouble than they're worth.
They aren't perfect. I don't really know what I was thinking with the first one, but I'll just rephrase it to remotely controllable oven.
You can read more about what Roomba can do here[1]. If it isn't for you that's fine. Not everyone needs to buy sauces all the time. Usually just a look suffices.
The problems you talk about aren't against IoT but just the use case I specify here. They're very solvable and there are many more uses than I can talk about.
I'm not a salesman for these products so I just said what came to mind.
When any new technology first comes to market and tries to blow everyone's minds away, it often fails to make the entrance it anticipates because, in your words, "they're more trouble than they're worth". But all they need is some rethinking and time.
When PDAs first came out, my dad scoffed at them and used a large notebook to write down notes. But today that's changed. I think that'll be the same with IoT. We're increasingly moving towards a more electronic home, and that's not stopping anytime soon.
It just needs some time to reach proper attention just like phones did, and we'll have standards (hopefully) which can harness the power of connected devices in your home. As the other commented to GPs reply said, a great factor is energy saving too. Intelligent devices can figure out by themselves when to turn on and off, and that can do a lot of power savings.
2. Lot's of issues, my presence does not determine my need for coffee.
4. Sounds great but in reality you won't be able to see things hidden behind other things or if a sauce bottle is full or empty.
7. What does roomba do that I need apart from a timer?
From your list is seems like we'll have an internet of half working things that everyone turns off after a week because they're more trouble than they're worth.