You’re right: “meaningless” was a heavy-handed attempt at continuing the parallel on my part. And sure, they weren’t doing anything wrong, but they fundamentally were wrong in the rules they followed previously. Similarly, if you adjust a principle, you admit that it didn’t hold for you in the first place.

As a tangent: while the parallel to scientific theories is good on the surface, it does lump in this idea that there’s a universal set of correct principles. Isn’t that just philosophy, then? Logical arguments about which principles are sound & universal. Maybe the lesson is to pick principles from the battle-tested ones rather than trying to develop your own.