Sorry dude, but killing the “Turn in” NPCs has been a thing even since Alterac Valley back in Vanilla.
And btw, AV is even worse, since the Archdruid/Primalist does NOT respawn once killed.
Killing the NPCs in Ashran is a creative strat that DOES have counterplay.
Just have some people defend the NPCs if you suspect they will be killed.
Sorry to disappoint, but summoning Fangraal/Kronos is not the main mechanic of the BG.
Yes it helps you win, but it’s not required to win.
It’s kinda like summoning Ivus or Lohkar in AV. Yes it helps, but it’s not necessary.