Are other community boards willing to take on the burden of reviewing all chain stores?
At first this doesn't seem to tell against the NO711 proposed zoning amendment. Other community boards wouldn't have to consider any chain stores if they didn't want to, so the zoning proposal doesn't constrain or burden them.
But members of the community might demand a hearing over a chain store, and such a zoning amendment would make it difficult for the community board to ignore them. It's not a pretty reason to oppose the zoning amendment (to preserve the CB's right to ignore the community??), but it's a possible one.