Firstly note that there is no “AF take” on anything . AF of course stands for “actual freedom”. However, actual freedom, along with actualism, are not worldviews, philosophies, schools of thought, etc. Rather, actual freedom is the state resulting from self-immolation, and actualism is entirely experiential, i.e. it is all about experiential reports, what happens, what works to become happier and more harmless, what doesn’t, etc.
What there are are facts… and the facts are plainly evident for everyone to see. And, when the facts are not known, there are opinions or suppositions or speculations, etc., where actualists will not necessarily agree because we are not all clones of each other .
(Of course as actualists are still feeling-beings there will also be beliefs lurking as facts or opinions… but one of the tools to facilitate the actualism method is, of course, dismantling all said beliefs.)
Now, the approach/avoidance response in humans essentially refers to the pleasure/pain principle, which is essentially what hedonic tone is. Factually speaking, every experience as a feeling-being is affectively tinged with either a positive/‘good’ hedonic tone, or a negative/‘bad’ hedonic tone. This occurs before it reaches a feeling-being’s conscious perception - everything you experience already has this hedonic tone overlaid on the pure/bare experience itself.
Note that this does not come from the result of interpretation or projection or reflection, but rather happens instinctively/intuitively, and there is no way to shut it off besides going into abeyance (i.e. a PCE) or becoming actually free. It is innate, inherent to being a feeling-being, that the world is experienced this way.
Of course, this hedonic-tone complex disappears upon becoming actually free - the pleasure/pain principle vanishes, there is no more approach/avoidance response. (see: Selected Correspondence: Hedonism & Anhedonia , “hedonic-tone complex”, which links to the full reply at Mailing List 'AF' Respondent No. 74 ).
Concomitant with the evolution of hedonic tone has also been the evolution of various reflexes or responses, such as the startle response - suddenly pulling back when touching something hot or on, say, spotting a snake. This apparently is unrelated to the affective hedonic-tone / pleasure/pain principle because it continues to happen in actually free people. Yet, while in a feeling-being the startle response would be immediately followed by a feeling-reaction and negative hedonic tone, this latter part doesn’t occur anymore (see: Frequently Asked Questions What are Instinctual Passions?, “startle response” ).
Speculatively, I would say that the basic amoebae’s approach/avoidance ‘response’ evolved into the affective faculty itself, predicated upon this basic good/bad out of which the rest arises… and separately from that the non-affective instinctual reflexes/responses. More than one way to skin the cat (i.e. survive in blind nature) .
It is interesting to note that pleasure and pain themselves don’t cease occurring in a PCE, rather they are experienced anhedonically… which is quite a thing! I highly recommend you try it.