I tried clicking on "Use as Defaults" (in Ventura), and I didn't see any purpose to it other than to set display parameters, nor do I see any potential purpose to it in our context. After all, once MG2009 changes "HD," new windows will open up in gallery view, and all navigation will remain in gallery view, so se doesn't have to change every folder individually.
I didn't do extensive testing, but I did find that folders opened with a hotkey opened in their default view, not gallery view.
