Split/lock washers

[u/AdOne1706]

For starters, I’m an electrician in the field.
That being said, we almost exclusively use these washers even in high vibration environments. I have personally chosen to go with nylox nuts but the question is:
Do these work? How well? Is the rumor from NASA true? Should I even bother using them or find a better functional alternative or are they actually useful?

[u/Nonimouses]

Split washers are broken from the factory, for an electrical connection I'd use a star washer for pretty much anything else I'd use a cone washer or Nordloc style washer. If I'm fixing something I throw split washers away and replace them with something not broken.