I sort of agree. I tend to not write things way above my level because I know there'd be so many corrections and that if I read over them very few, if any, would stick. I hope most people would stick to something like that, you stick within your level, maybe using one or two things you don't have quite a good grasp on so that you get corrections and feedback about it. But after a certain point, I agree using the language a bunch is definitely beneficial, which is why I started my thread in the French subforum, I figured writing a short paragraph each day can't hurt.
I also agree that making mistakes is part of the language learning process, and you shouldn't freak out over them. Failure is just feedback, it lets you know what to improve.