You can't dissociate from what you "believe" is happening by invoking the "IS". Every tick of PA is incorporated into your experience or "belief system", what you BELIEVE will happen after that tick.
You can't trade on just the "IS", you'd be taking every long or short tick up. That price action is fed into your greater belief system forged from experience. You ignore it, or you take the trade based on your belief of forthcoming profit. You get out the same way./
The "IS" is only a small pat of the trade.
First, let me say that is a good lucid post you've made
@big mac.
However, your reasoning between IS and BELIEVE is missing the defining component known as CONTEXT. It is through context, where IS exists. Everything else, once context has been established, is BELIEF. In a context, x,y, and z are expected to occur. Is that what is happening? If not, the trade is wrong, for that context! Not as a belief, but because the trade is wrong, for that context!
I liken this to Russian Dolls... one inside another, inside another, etc. A vein, on a leaf, on a branch, on a tree, in a forest, in a jungle. A tick, as you've referred to in your post, is the smallest Russian Doll, a vein on a leaf. But that vein is pretty meaningless to a trader who's context is a forest. Just as a 200/day MA is pretty meaningless to a trader that uses say 1 minute charts for making many round-turns each day. Each Russian Doll, each category of nature, is its own context. Related to the others, but separate, until price action changes the context. A simple example would be a retrace might be a leaf on a branch. The trade you are in is either the leaf(the retrace), or the branch(the dominant direction). x,y,and z are expected. Until the context changes, in this example, the retrace turns into a full reversal, changing the context to the tree, then and only then, a new set of x,y,and z would be expected. (fwiw, that happened 3 times last week for me... I use 2min, 4min, and 20min charts, leaf, branch, tree) When context is confused, belief, takes over. Trading "I think", is pure chance. x,y,and z are expected due to a context, not chance. In context is what IS happening. Note: my use of x,y,z is merely nomenclature. there is no specific relevance of count. Point being, expectation, not chance.
I suppose one could make an argument that context is based on experience and beliefs, but... that does not make context itself a belief. Everything that occurs (or does not occur) within a context, IS expected or not...not a belief.