A full editor will not be able to run on a console,because editors need more resources to work that the actual games.
For example while creating let's say a level you might do something you regreted,and that's why editors as all other computer programs have a "undo" button.
What is happening is that not only your current state takes resources,but editors need amounts of RAM to store previous states of your work in case you want to undo something.
And modern consoles just doesn't have enough RAM for that function to work,and trying to work without such a function would be very VERY frustrating if let's say you are working for 5 days on a single mod and then you regret something you did 3 minutes ago and then you have to start re-working the same project starting from 0.