Yes, and that “something” can be an app like gnome-terminal running on a full-fat text rendering library and GUI framework… on a completely different computer.

Yes, and that “something” can be an app like gnome-terminal running on a full-fat text rendering library and GUI framework… on a completely different computer. That software could hypothetically have the same bug, but probably not, and at any rate it‘s not taking up space in the core of a microkernel.