PukinDog,
Very well detailed and thought out post.
To add to this, 28R has the FMS/RNAV visual, but it also has a pure visual approach, (that does not align with centerline) which several other aircraft preceeding them had used.
Should the FMS on the ac be off, the visual approach is still there, if nothing else, as you very well illustrated, the visual clues to back up the automation.
With the FMS visual procedure, the airline and the individual crew must be authorized to use, so there is a bit more involved in training, and hopefully the briefing.
That big white cross at threshold, that is not difficult to miss...
Looks like we also need this on the taxiway.