The devil is in the details......

WD-40 can be great to dry out some electrical bits, as well as loosen dried lube (grease and/or oil) or loosen rusted iron bits.
It has, basically, NO lubrication in it, so......it can get things moving, but likely NOT keeping them moving.

I use about 12 different lubes, depends on the application, currently I like "fluid film" as it sticks, works well and is limited in negative effects due to temp.
Silicone spray when I'm dealing with rubber or similar.
LockEze for cables, locks or small parts since it's basically graphite.

Yes, WD-40 can free it up, but it WILL fail again due to lack of a real lube.

Taken from a "mechanical guy" of over 40 years, doing facilities maintenance and auto/aircraft during that time.