The Dialogue Editor is out there. Write a quest, submit it, get feedback on it, rework it, submit it. Finally get it approved and put in the game.
Nothing stopping you and afterwards you'll appreciate how long and how much effort it takes to do something which is summerized by "Add more quests".
Then do it over and over again, because players will just demand it of you, "you've added one quest? Great, now make more"

All in all, people are doing these things. If its not fast enough have a go yourself and submit it, we can always do with more people adding things at the required standard.