^^ It's about the subject interpreting someone else's imagination. Ok a practice but it seems at worst destructive of, or at least attenuating of the meditator's own imagination and discipline. It's like using crutches when the person can walk perfectly well but is on a strange path.

I liken it to if I'm trying to compose a piece of music, someone is telling me what to write out.

It has a single purpose to me - helping the very beginner to understand a process and once familiar, they ditch it.