Because there simply is no answer. It's literally people trying to get other people to pay for the development costs to find out what it is and what it's good for.
There is no consistent definition, no standards, not even any really good use cases.
It's something people have latched onto, and decided that, even if they have no idea what it means, they want to cash in on it.
People have come up with some things around it, but they've not addressed any real world issues like privacy, security, or what the hell to do with it. It's like in the late 90's, where the frenzy happened around "teh dot com" -- if you had a frickin' website, you had VCs throwing you enough money to make some people rich, and ensure there would be a healthy resale market for Herman Miller Aeron chairs.
You didn't need a business plan, a product, or any actual skills in running a business. It was simply a feeding frenzy of stupidity.
IoT is a bunch of people trying to capitalize on a buzzword nobody can define, with technology nobody has yet built, and trying to find other people to help pay for it. It's a though experiment by people who have read far too much science fiction.
Nobody can answer any of these questions because they're still making it up. It's a gold rush to build vapor ware.
It's breathless futurists telling us this is the future without being able to tell us why or how or what we'd do with it. As I said, it's snake oil, nothing more.
It's literally years away from anybody even being able to give plausible use cases, and several years further away from anybody giving a damn about it.