SO I just found out that DOS2 has only a DM mode editor and no stand alone editor, meaning you can create a campaign and let other's play only if a DM hosts. Now maybe there is a way in the future to create campaigns and let people run it without a DM. I saw the video and the editor is pretty good for DOS2, I woudn't mind if we get something like that for BG3 and more.
I do want however to be able to have the OPTION to create campaigns designed to be hosted by a DM OR to create campaigns without a DM, meaning that you can play solo with an AI custom party and run the campaign in that fashion.