I was telling, for example of Cold domain, I wouldn't mind much to see someone taking Necromancy as his forbidden school. Being able to understand one spell among a whole school is not such a big deal. But then I thought, what if I choose Necromancy Domain and Necromancy as a forbidden school?
Just for that example (and all other schools example) I think you are right. Even if that chill touch seems the most acceptable example to go against that, all other make less or no sense to me. I don't see a Battle domain wizard forbidding Transmutation (with most boost spell) or Evocation (with most offensvive spell) or Abjuration (with most defensive spell).