It all depends on the player.

Me for example, I do not like being behind when playing MMOs. It's why I often avoid jumping into older games and dislike having to play catch up, an exception is when there are fresh new servers added but that doesn't apply to these kind of games. Though thankfully for this game, there is no PvP systems and no in-game interactions, so I don't have to worry about competing with others.

Also I do not want to be spending an hour just to burn through my stamina farming low level stuff when I can just farm higher level stages in less than a quarter of that time.

So if I ever need to spend a FG on stamina, I do it. Though I only do it for dragon farming as I can't be bothered to wait an entire week.