I would certainly ignore advice from someone who had had no instruction. And I would hope that members would not give advice on things that they have no experience with. However, there are all kinds of difficulties in formulating policies in this area:
1. Some members don't appear share that view.
2. How would you propose to enforce such a policy? There are thousands of competent teachers out there, most of whom none of us have ever heard of. So how could you possibly check?
I happen to have done some short retreats or one-day workshops with well-known, or reasonably well-known (as in, you could find some of their talks or writings on the internet) bhikkhus. However, those who I have really spent time with, and who have therefore taught me much more than the "famous" ones would be totally unknown to anyone else here.