Meaning DE is just going to the college? Of course, there are college based ECs.
The college does not have college soph level courses in subjects where you will exhaust the most advanced high school courses? What about academic subjects not commonly offered in high school like philosophy, sociology, economics, geology, history other than US/Europe/world, political science other than US, etc.?
If the offerings are so poor that there is nothing academically suitable left to take, the argument for early graduation is stronger.