I had written a lengthier response, but decided to forego it for these two to the point paragraphs.

If you haven't met the demonstrated practical skills competency objectives of Fundamentals 1, you're not 'holding yourself back'. Ergo your time would be best spent helping yourself 'move forward' by doing so.

IME&V there's nothing 'wrong' with applying a parallel path non-linear approach per se, as long as you're not misusing it as a titillating distraction to avoid the less exciting necessary repeticious slog until rote.