Probably quite a lot - if you look at what Anthropic found around persona vectors; https://www.anthropic.com/research/persona-vectors.

I imagine the context will always sway the model to some degree, not only for the task you're trying to get it to do (aka instructions) but also its persona, how accurate it is and the way it acts.

Based on my own experience with vibe coding difficult stuff outside of my expertise, I definitely got better outcome with Fuck you, shut up and do it, ffs, you are moron.