"We don't do that here" usually doesn't mean "not now" or "not in this setting." It usually means "not ever while you are employed at this company."
Even if it’s not a hassle to have the conversation 37 times, that 38th one could be huge drama!
For most people, a short debate is sufficient. But you will spend almost all of your time with that tiny percent of people who rules-lawyer their way through life: Pointing out the lack of written clarity, complaining about 'hidden rules', writing a letter to object, appealing to your boss, appealing to boss's boss, lodging a formal complaint with leadership, getting actual lawyers involved, and on and on and on.
"We don't do that here" actually seems like a great way to express this. Discussion is not verboten in general; this is just not the place for it.