I believe that you would never need parentheses if you always use the full form. In fact, I think if you used the full form, you couldn't use parentheses in any meaningful way (i.e. there is no syntactically correct way to use parenthesis in non-trivial ways in the full form). I say "believe" and "think" to hedge my bets here, because I haven't done an absolutely exhaustive study, and maybe there is some arcane example that I'm not aware of. But I think that for all practical purposes at least, the answer to your question is "yes".