Whether it’s a GPS coordinate or knowing to use the knife in a mystical way, it’s still a piece of exposition that they needed 3PO in order to reach. I guess it does soften the impact of his sacrifice in a way not to have something pretty concrete to gain from it, that’s fair. In movie parlance, you’d expect information like that not to be costly, and would arise on its own. Y’know, sort of like how it does in V1 with Rey hearing whispers.

I’ll give it to you, that is something to weigh and consider in assessing this potential alteration.