Only high end Sculptured systems will have their own reality (High Level Corporate R&D, Entertainment Industries, Etc), for the most part
Uh. No. This is blatantly wrong per canon. EVERY node is sculpted with its own metaphore. That fancy Matrix Cafe?* Well, it's all decked out in 1980's Disco Theme and there's a rave party going on. The Library? Is a -ing library on the matrix. In the real world it doesn't exist.
Check the Virtual Reality section of the Matrix rules. "VR environments are fantastic for intense and realistic [...] experiences." That implies at least some basic level of sculpting is available at all times.
Also, as it specifically refers to "VR simsense sculpting" it DOES NOT work in AR.
Oh, and in case that wasn't enough, go read Psychotrope.
*Hint: Matrix CAFE. As in, a cafe in the matrix, not a cafe with a matrix connection.