but we can all see where that led!

It led to the LED!

I would say this is likely not a practical super conductor… But it may well be the first ever room temperature super conductor.

Yes of course it would be a big deal if they create one to begin with. However if it's difficult and expensive to produce, that's not much help. It has to be mass producible and inexpensive to have industrial significance. I mean we already have expensive solutions. Don't need any more of those.

The first semi-conductors were not practical either, but we can all see where that led!

I don't know that semiconductors are a good parallel. Growing the crystals dates back to the early 1900s and was never an expensive or technologically difficult process. Doping silicon to create devices like diodes and transistors was something new, but was not exceedingly expensive or a great technological challenge. The migration to chips which require lithographic doping was more of a challenge.

In any case semiconductor devices were practical shortly after development. One of the first consumer products that used them was the "transistor radio" which was inexpensive and came out shortly after invention of the technology.