I will wager you 100$ that less than 90% of them will know, with any accuracy what their policy says. The documents are simply beyond the average person's capability. Then there is the issue of agents or brokers giving incorrect interpretations of the policies. If they can't read them, no way will the public be able to.
I would say a good broker understands those policies pretty well, at least he should. As he is a representative of the company, information the broker gives you in writing may end up binding on the company, so before he tells you 'don't worry about betterment' he should look at the policy or check with his underwriter to give you well founded information.