Things are what they are because of constraints. Which is more general, and assumes less, than appeals to causes.

Constraints need not be prior. They can can be simultaneous, i.e. co-constraints. And they can be internal to the whole, i.e. all of reality can be a co-constrained structure without external constraint.

An ultimate law of conservation is a strong candidate for a self-constrained reality. All versions of forms existing that neither locally create nor destroy. And since all possible forms within that exist, no choices made universally and there are no conserving forms it excludes. A coherent, infinite, unique, zero information structure. (Uniqueness is inherent to a zero information structure. Non-uniqueness necessitates choice.)

But claiming that some things just are, with no structural necessity, is an appeal to magic. A specific, with no actual constraint matching the specificity isn’t coherent.

You don’t get something for nothing. There is no outside of reality to provide that.

Any “outside” just means that total reality was not being included in the analysis.

I am not saying we can practically figure everything out. Or that there may not be questions, that given the limited resources/laws of our universe may not be answerable from our position, even theoretically. There may be questions we can’t answer. But nothing specific “appears” with some magical independence from the rest of reality.

That is the non-taulogy of it “just is”.

It would also make reality as a whole irrational. Not even a structure that obeys a conservation law. Because it would have specifics that had no reason.