There is a bigger underlying point, which is there is no trump weapon that defeats everything in war [1]. Everything has a counter, and if you're basing your entire strategy on saying that this weapon doesn't have a counter that we know of yet, well, you'll find that counters quickly get developed (see, e.g., the evolution of drone warfare in the Russo-Ukrainian War).

Ripper's argument that his tactics "won" the Millennium Challenge strike me as rather similar to the thoughts behind the Jeune École school of naval warfare, which argued for the use of massed small ships (torpedo boats) to counter battleships... except that had an easy counter in the form of the (torpedo boat) destroyer, and most naval theorists generally agree that the French Navy's embrace of Jeune École ended up doing more harm than good to their navy.

[1] The closest thing to a counterexample here is nuclear bombs, for which there isn't really a meaningful defense. Except that the use of nuclear bombs is predicated on the theory of strategic air bombing, which has been promising an easy-win button for wars for a century now, has been tried in every major conflict since then, and whose could-even-be-argued-as-maybe-a-successes in that timeframe can be counted on one hand, with some fingers missing. I'm galled that you still have military personnel and advisors today who advocate for its success, given its track record of the complete opposite.