In game editor and the full editor?

What is the difference ?
I have bought the editor and at only £4 its not an issue , but I seem to be able to do everything I want within the ingame Editor.
For eg Stadium Capacity can be done within the ingame editor so why would I use the FM20 Editor?

there are so many things you can do with the pre game editor that you cant with the official IGE the list would be huge, the IGE is limited to some basic editing only

The SI IGE is also inferior to the other in game editors that are available now that offer far more in terms of features