The reason boss runbacks get largely reduced or removed in later games is that they fall into one of two categories. They're either easily trivialized once people learn how to play these games, or they're awful bullshit like this.
Even then Elden Ring tosses in the Placidusax runback for no reason.
Also the runback for either Chariot or Skeleton Lords (I forget which) becomes pretty stupid in NG+. DS2 is like the only game that really adds shit to NG+, but it's not always for the best.
"One toot on this whistle will take you to a far away land."
-Toad, SMB3