It's less a real result than just understanding how they work. I thought I could throw whatever in and it'd be scaled down or up to make it fit in these containers. If I just need to be careful with the size of things I make outside, that's fine, if a little more annoying than how I thought it worked, lol.
The scaling doesn't work quite how I want, but I imagine that has more to do with VBoxContainer than anything else, since it's specifically not working how I want vertically.