If you do something sufficiently, you’re not wowing anybody, but you've done enough to get by. It’s fine. If you do your homework sufficiently, you’ll pass but don’t expect a gold star and applause.
When something is sufficient, it's enough. Therefore, when something occurs sufficiently, it's also good enough in some way. If you’re sufficiently fluent in French, you can talk to people in France, but you’re not writing a French novel any time soon. Doing work sufficiently means getting the job done without going above or beyond. Doing something sufficiently is still much better than doing it insufficiently, which is never enough.