So I am in this situation.

My opponent found a way to counter my Sentry by sending his subs 1 by 1 at the same time, with the big subs at the end...maybe a too easy way? Do you think this technique should be nerfed (for instance by giving splash damage to the sentry), or you think it's legit?
In my opinion it's definitely a clever move, but in the end people will just start sending subs like this without thinking much, whenever there is a Sentry, as it has no real drawback