At a certain level I agree with the OP, but only where "basic understanding" is something that can be decided between two people.
Characterizing whether or not my wife has an appreciation for the tools I use in my job as a measure of the strength of our relationship is, for us, completely invalid. My wife can barely explain what I do for a living. But she knows that I love what I do, and she's supportive within the context of what she understands.
This post really just speaks to how this particular person measures her relationship with her partner. Anyone else drawing out this singular aspect of a relationship as a gauge for matrimonial harmony is on a fool's errand.