I think that the difference is that somebody from elsewhere in the country, or perhaps even the other side of the world, is unlikely to travel to my little parish council's meeting place, so the bouncer may not be necessary.
As Clerk, I never saw my role as judging who may attend. Anybody with a legitimate interest was welcomed, whether parishioner or not, but I simply asked them why they wished to attend and whether or not they wished to speak. We do, at all times, ask members of the public to submit their questions beforehand where possible, although we would never deny somebody the opportunity to speak if they failed to do so. It speeds up business by enabling us to provide an immediate answer in many cases, which is a significant benefit in a parish where the Council meets only six times each year.