I find these “agreements” utterly idiotic … why would one fighter accepting to diminish his skillset and potentially the chance of victory is somehow a proof of bravery? It’s MMA, it is exactly about being able to implement a wide variety of techniques to defeat your opponent. If someone is weak in one area the opponent should absolutely exploit it as much as possible, not accept some silly “agreement” to avoid using that skillset.
Also, it’s one thing if you’re winning, but if you are getting beat up but keep the “agreement” rather than use your full skillset you are an absolute fool.