I disagree with that. I think there is an absolute "what's going to happen" and sometimes we pick up on it and sometimes we don't. People change, of course, but our jobs is to predict that continuum . . . we need to look past what might happen and try to understand what "will" happen.
I have made hundreds, at a minimum, of exact predictions for people they assured me were impossible. They weren't -- it happens all the time. I am not 98 % accurate or any of that nonsense but people are as predictable as floods . . .
If I say something is going to happen and it doesn't, it wasn't because someone's free will came in to play, it was simply me not accurately forecasting what would happen. But there is a stronger fixed element in human behavior than most people are probably comfortable in admitting.
The ability to "influence outcomes" is dependent on a degree of consciousness. The more "self-aware" the individual, the less predictive, in my opinion, the natal chart and all people, of course, have an element of "free will" at their disposal . . .
but to think that psychics (not just me) can't predict exact outcomes is simply not true. There are many people whose "outcomes" are easy to read and unlikely to change
this may annoy a few people (what's new hahahaa) but it is the truth.