I like the option of "Trim View" to temporarily hide artwork that outside of my artboard. But when I have overlapping artboards and I try to use trim view on one of them Illustrator combines the area of the overlapping artboards and trims everything outside of that "merged" artboard. This defeats the purpose of using trim view for me. I would like trim view to isolate the artboard I'm working on and only that artboard. It would also be nice if the black lines showing the other artboard extents would also disappear when entering trim view for a single artboard. The cherry on top would be the ability to control the opacity of the trim view, so that I could still faintly see the artwork outside the artboard.

FYI - my artboards are overlapping because I'm using them on a large map file. The map covers a large area and there are multiple printed map products coming from it, each with their own artboard extent (so I can quickly save out pdfs based on artboard extents). My current method of isolating one artboard is to just create a large rectangle with a hole cut out that is the same shape as the artboard I'm working on. Trim view seems like an easier method of accomplishing the same thing, except that it doesn't seem to isolate artboards if they are overlapping.

To illustrate:
Screenshot #1 shows a map file with many different artboards. I added red rectangles to show where all the artboards are.

Screenshot #2 shows the same file with trim view on (and the red rectangles turned off).