Not OP, but not really. The real issue is that WD-40 is kinda like duck tape. It definitely has its uses, and hoo boy are there a lot, but it's too much power too fast, and corrupts young engineers and repair people into using it as a "fix all tool."

Sewing machine oil is a wonderful penatrating oil. This is what you use on tools inside the house that mostly just get a bit dusty.

WD-40 does contain some oils and can be used as a penatrating oil, but it's mainly a cleanser. You shouldn't leave it on anything that will be damaged by cleansing solutions, so motherboards, plastic in general.

For a general use oil, for hinges and things, I will clean with WD-40, and then once I have cleaned it I wipe it down with 3 in 1 penetrating oil, for things like door hinges, or sewing machine oil for more delicate tools.

Edit: I had not seen the flowchart below when I wrote this comment, but it illustrates my first point beautifully