The end result of having adopted a flawed approach

In times past, when containers were handmade, the most basic test of reliability was whether it could be used to transport liquids, such as olive oil, without leaking. Just looking at a dry container would not be sufficient proof for being air-tight as flaws the size of pin-holes might escape detection.

If a container could pass the water test, it could then be used to transport more valuable liquids.

Thus, if your argument doesn't "hold water", then to continue the metaphor, "you're all wet".

As anyone knows who has ever been caught in the rain, wearing wet clothing can be uncomfortable and is thus a bad state to be in.