I think the Stormerne-Whisperz situation represents a valid draw. Black needs four pieces to make such a fortress plus at least one piece to protect the king, this complicates positional considerations in a way that I think probably helps balance the game. Black has to be wary of avoiding exchanges as this could lead to white creating a fortress but on the other hand too many exchanges will open up lines, in white's favour. As the strategy of both sides involves keeping an eye on fortress building possibilities as well as on the king's capture or escape, I think this drawing possibility also adds to the games complexity and depth.