Its really easy to modify a quadrant in notepad or similar. Systems are not much harder. A GUI editor is not going to be able to do much to make it any simpler, other than a list/tree view of names to click on instead of the ctrl-f search mechanism.
The python scripts just make it easy to add a new system type, and add it to all quadrants automatically, keeping chance values mathematically sound. Their primary purpose is to keep track of all the data and variants. FQM SE4 got out of hand.
The scripts certainly aren't necessary for tweaking the data. Maybe if whoever makes a GUI editor for quadrant type stuff implements that sort of functionality, it would actually be useful. Hint, hint.