They don't really have a different use. As you have said, they're following bitcoin which is a payment for all transactions and the same use. There's no difference between the use of bitcoin and these altcoins. They have a preferred industry to be made as a token but that's just the same as bitcoin being a payment for most transactions. It all started from the ICOs which preferring to the industries that they are promoting like in Energy, precious metals, you name it, there are many of them before.
I have been here long enough to know that even for socalled utility tokens,,, the uses are all made up. They are logical and rational,,, but the motivation is seldom big enough for people to want to use (usually for cheaper or faster but nothing is as cheap or fast as Visa at the moment).
Worse still is getting merchants to accept alts. Almost near impossible.
Time after time, most merchants and people will start accepting the most popular cryptos. Those projects that are still making tokens and calling it as a utility will have to stick to their products.
But in real world, they will mostly be ignored because of their focus as a utility to a project and product that they're working at.