What are the differences between [allowed-topics] and [scope]?

Question

I see that we have two meta tags that are similar, if not synonym: allowed-topics and scope. Are they really different? If not, should we merge them?

See also on Meta Stack Exchange: What is the difference between the “scope” and the “on-topic” tags on most child metas?

Answer 1

I've merged the tags and created a synonym, thanks.