I've successfully run around as a solo warlock avoiding battle engagements but fully engaging in dialog.
There are several instances where I get misattributed as engaging in combat when I have avoided it. (such as druids thanking me for fighting off Gobs - you could argue their intel was just bad but demanding I am let through for saving the grove feels a little off)
but the Biggest problem is double Auntie Ethel. If the brothers decide to fight you and you run past them, she will be at her hut and assume you've killed them in her dialogue. Returning to the brothers, Ethel is still there hoping to be saved despite also being at her hut.
I think a lot of quests didn't expect the player to straight up run away.