Just for farming dumplings, yes, otherwise, using FG for stamina refill isgenerally seen as a waste of the FG, though I personally think that once your maximum stamina gets past 320, that it might actually become worthwhile to occasionally use one, to do some extra 80-stamina manyu or dragon runs. By the time you reach that kind of level, you should have a pretty good idea whether the extra stamina would be more valuable than saving the FG for gachas for your situation. Generally, the answer is no, but sometimes, it will be yes.