The whole point of Roberts Rules of Order is that the membership is in charge. Motions, after being discussed and amended, eventually come down to a vote of the group. That's the basic mechanism of democracy.

Most nonprofit membership organizations in the US were run that way at one time. But since the 1960s, there are more self-perpetuating boards and other schemes for taking control away from the members. So people don't get practice at running a democracy. Which is a problem.