I’m not sure that I understand your question, could you get more specific? For their conceptual difference, read this answer.
- Not to my knowledge, but I don’t follow plugins closely.
- It may be possible with queries, by using a really complicated
:view. - EDIT: Now there is a way
It is simple in essence, namespaces are surnames: When two persons have the same name, we differentiate them by their surname. The name is template, the surname is Logseq.