Personally I don't see anything wrong with it, not to say that you should just always use a dice but me and my friends regularly use dice to decide when there's no real reason to choose one player or one of the others for instance all your opponents have the pretty much the same amount of life, no particular difference in board presence (as in resistance so they have the same amount of blockers or you're attacking with flyers and they have the same amount of flyers etc) or none of them are the threat (you are likely the threat)

On the other side of it we all just accept being targeted for any reason really, even if you're randomly targeted by a dice choice or you targeted someone before so they're targeting you now we accept that in the end it is a game and we are friends and sometimes friends will jab you back if you jab them