I know it's hard to quantify, but are rocket designers and astronauts more happy about the possibility of cold welding, or more negative about it?
I mean: two "bare metal" surfaces in vacuum weld together in the ambient temperature of space when they come in contact. In one hand, it could be invaluable in construction work, saving the whole bother with welding equipment - a good smack of a hammer will take care of bringing the elements in contact firm enough to form a weld. On the other hand, everything that isn't supposed to weld itself to anything else (like the aforementioned hammer) must be coated with, or made of non-welding substances. And if the protective layer is scratched, that still can "catch". It must add quite a bit of headaches.
So - in the absolutely subjective opinion of space equipment makers - do the headaches outweigh the benefits or vice versa?