Today, the verbiage of the default display properties for linked files, "By Host View", would give any reasonable person the impression that the linked model is displayed according to the graphic settings of the host view. However, for lineweights and phase filters, among other things, the link only superficially appears to be following the settings of the same name in the host model. In actuality, the link is displayed according to the settings within the linked file, even though these may frequently differ from the host view. For example: walls in a linked file may be set to display by host view, and you can override what pen number you want the walls to have, but the lineweight associated with that pen number is drawn from the link, not the host. For files from consultants with different model standards, this is highly problematic. An even worse example: for phase filters to work at all on linked models, the same phase filter with the exact same (case-sensitive) name must exist in both files. You can tell a linked model to follow a given phase filter, but if it doesn't exist in the link, the phase filter won't work on it.
Proposal: linked models to actually adopt all graphics settings from the host, just like anyone would think it should.