for example, on a linux distro, we could modify the desktop environment and make it waaaaay lighter by getting rid of jpg or png icons and just using pure svg on it.
Isn't that how it already works? GNOME system icons are all SVG - that's what allows them to change colors when you change themes or switch between light and dark mode.
Exact same thing happened to me. I opened it, read through the new welcome screen, and said ok let's go! First move was to select a brush and it crashed.