For the near room temperature superconductivity they need an extreme pressure. It is much easier to get a low temperature (e.g -200° C range and likely also the 4 K range) than getting that enormous pressure.
With the high pressure they are also limited to tiny size. It may help a little with research, but I see no real break through.
I don't see any direct consequence to practical application.
Already the so called high temperature superconductors that work at some 50-100 K behave a little different from the low temperature ones. So far no Josephson junction array working at 77 K, though there are a few squids to work at 77 K and they may be useful in a not so exotic superconducting current comparator. 77K still sounds pretty cold, but it's a whole lot easier than 4 K. A quantum reference working well at 77 K would be a more relevant break through.