Is it useful to think of dimensions as having boundaries that are not the same for every consciousness? Looked at in that fashion, there might be infinite dimensions. Is there truth to this perspective?

Here again, you are mixing metaphors still. The dimensions are the same to a spirit meddler like Lucifer and to an archangel like Michael. It is a question of being allowed access, so the boundaries are not different. The capabilities of the individual entity in the case of Lucifer are being constrained. That is akin to lacking a passport for foreign travel to create a natural confinement within the country of origin but does not mean that all entities are not following particular rules to move about from place to place. All must conform to the energetic requirements and that is what constitutes the difference here. The dimensional domains are the same for all entities but the variance in the entities and their energy determines whether they are compatible with entry to a particular dimension and whether that will be feasible for them or not.