(lots of comments about this discovery call this revolution that will change everything around us and that somehow implies mass production I guess)
Also, it’s not extremely toxic - romans ate from lead dishes and didn’t even notice the toxicity.
You don’t want to consume it, and you don’t want to breathe it, but it’s not as bad as say, asbestos.
If you have an ICE car, it probably has a lead-acid battery, and the only thing that prevents us from using lead in grid storage is their short lifespan - not health or ecology :)
Also, if you ever took an x-ray, you wore a lead jacket to prevent unnecessary radiation.
If we cannot avoid lead in this alleged superconductor, it may limit applications slightly, but not by much.