GreyCatshark
GreyCatshark, No, I don't agree with what you are saying.
Firstly, The universe is standalone and self-sufficient by definition, is it not? There is no Platonic realm or other such external support, to fill the explanatory gaps.
Secondly, we ARE "allowed to ask how or why certain actions happen instead of others". I'm contending that time-place consciousness and agency are necessary logical aspects of a system, of the real-world system, possessed by matter. I'm also contending that these logical aspects can be represented by the use of logical symbols, just like the statements in a computer program. However, the physical aspects of matter are represented differently: the physical aspects of matter are represented in terms of categories, relationships ("laws of nature") and numbers. This is significant: the type of symbolic statements used in computer programs implies that physical and logical are two different, but interconnected, things.
These logical symbols are also the same symbols that one would use, in a computer program, to represent intelligence and/or analysis. This is also significant. The symbolic representation implies that you don't get consciousness and agency without intelligence and analysis, though low-level matter and the very first life would clearly have limited data to analyse. Intelligence is not a number; intelligence is a conscious and analytical approach to the world, something that is pretty well a definition of life, something that the very first life needed right from the start.
So, what I was trying to say is that, at its foundations, the world already had at least a primitive time-place logical aspect that is conscious of, and can to some extent analyse, its surrounding situation, so it is superfluous to also posit a type of layer where possibilities or potential states exist. "What grounds the choice", i.e. what grounds time-place agency (where agency over outcomes is symbolically representable using logical symbols, as well as symbols that represent matter's categories and numbers), is matter's consciousness and its (limited or more extensive) analysis of its time-place situation.