Every other vendor in the game either allows a rank reset, or you can continue to earn engrams past the "max" rank. His rep and reward track work the same as Fynch or Nimbus, where you gradually unlock rewards but then "max out". But unlike them, you just stop earning engrams at the max rank? What is the point of that? It's supposed to be a super rewarding game mode, but at some point the more you play it, the LESS rewards you earn? There's no point in doing his daily bounties after you hit max rank either.