What's the difference between にしたら and の上では


There has been a post for the difference between にしたら and として and にとって, but I
haven't been able to find anything about the phrase の上では which also supposedly
means "from the viewpoint of" or "according to" So what's the difference here?




(person) にしたら means "from the viewpoint of (person)" in the sense that you
would think/feel that way if you were in his/her position.

の上では doesn't take person to begin with and doesn't mean that. It takes objects
like theory, imagination, law, or document, and means "in theory", "in
imagination", "in law" and "as long as the document says" respectively, as
opposed to reality.

