Is it as simple as "understanding electricity better will let us design electronics better?"
Apologies if this is a silly question, I'm completely out of my depth.
I would also imagine this "electron fluid" only applies to DC circuit applications, because AC electrons are perhaps best represented by every discerning business executive's desktop toy known as Newtons Cradle.
Power-up failure of a PCB is far more likely to be due to inrush current burning something out or thermal cycling leading to a broken connection than a viscous-current effect.
Also, space-based devices aren't always cold: it actually takes a lot of engineering to keep them from overheating unless they're in perpetual shade, and even then you need to do more work to get to a superconductive regime.
Maybe the effects will be replicated in other materials or higher temperatures someday, and the experience won here will be important.
Regardless, it's cool to know it's been witnessed.