another idea, when editing constraints, would it be possible to zoom into a "fit" window of the constraining objects? so that if you have a large asm, your not lost as to where your constraints are at and you don't need to zoom in out searching... have it a toggle option in settings. I find this useful in other cad/cam software, where it brings me to the area of interest.
Something to the effect of when you go and edit a sketch, your zoomed into the working plane and it fits the window, similar idea would be great for the constraints, just maybe with extra held/pressed combo button?
Sometimes in a complex asm, with small features its hard to trace and find the selected constraints, if doing a zoom to fit window/ iso view or some user predefined setting, it would save a bit of time and even help remind what was done really fast
maybe even do some kind of a flash/blink on/off with a user set color of said faces/surfaces/edges (bold line if edges) to get our attention?
I think the issue with visualization is more to do with when the features are edges or really small/thin faces, having a visual exaggeration of them would help, maybe set a max pixel size or multiplier in the settings of things if they are x size?