Alphas get harder as you level with level 10 being especially difficult with boosts to alpha specials. This doesn’t hold true for Shellfire. Due to the mechanics, breaking balistas on a low level shellfire doesn’t do much. Thus a 3* Shellfire is not any easier than any other alpha, while at high levels, Shellfire remains the easiest alpha and a way for clans to rest and regain energy. This puts low level.clans at a disadvantage of not getting an “easy” alpha and also not learning the strategy that helps stronger clans.
I think shellfire needs strike her balistas at lower levels to adjust, not sure what the right level should be for which level, but it is definitely bot strong at 3* relative to 7* and above