I agree. If I got an email with "lawyer pomposity" in it, I would likely pretend I never got it and deliberately push back any accessibility plans out of spite. You don't have to stick "please" in every sentence, but you have to phrase things correctly. If it's phrased as a request, I would see an opportunity to make people happy and gladly go along. If it's phrased as an order, I would probably perceive it as an affront to my individual sovereignty and would be motivated to fight back rather than capitulate.