I meant as a whole we can't predict in practice what all possibilities are within the space of fractals in general. Like in the physical world, there are "spaces" and outcomes that are known - easy to interpret and predict - and others which are not. For instance Apophysis fractals were starting to lose interest for you because you could not predict at the time the possibilities of linear transformations, however from there you were able to develop more control. As far as mathematical prediction goes, it is technically true but not practical due to the virtually unlimited search space and chaotic interactions of some transforms. But maybe it can work in known territory and help build "roads" that make some unknown territory easier to explore. In practice I haven't heard much of people trying to manually calculate when it comes to fractal art, but people don't often say a great deal about their process.
Often it's the ares we can predict too easily that we get bored of and this pushes us to explore for what's new out there. But it's too unpredictable to jump all the way into the unknown and have no bearings so we usually operate in some sense on the "edge of chaos" between the known and unknown, expanding the known territory and thus our creative potential. I think this is true of creative work in general - artists and creative types are the people who are attracted to the border between the known and unknown, "chaos and order", where information flow is highest. Our sense for it manifests as "interest", and if we step too far off the line into either the known or unknown, we can feel our options decrease, either because nothing unexpected is happening, or because we are "lost" in territory that we cannot yet navigate effectively.
Here's a very interesting talk relating to AI and art that you might find interesting if you're like me.
"Kenneth Stanley: Why Greatness Cannot Be Planned: The Myth of the Objective"
My metaphor of known/unknown and order/chaos is taken from talks by Jordan Peterson - I find it a useful metaphor. This video seems to summarize it pretty concisely, especially around the 3 minute mark (the rest of the playlist includes some other talks related to the subject):
"Jordan Peterson: The Necessity of Artists in Society"