Even the script can't stop a user from copying data from one partition to another. So even if Ethereum only runs authorized and vetted scripts, this afaics wouldn't totally ameliorate the issue.
Edit: Of course (external) I/O from scripts can input to other scripts in a myriad of cascade and permuted entanglement.
When I write 'external I/O', I mean differentiated from referencing some data on the block chain as an input, e.g. UXTO. You see that for asset exchange, the data is deterministic because all I/O must sum to 0 and the directed acyclic graph assures us there is no recursion of the state.
What I mean is, is it possible to specify a set of non cyclic dependencies for any given transaction, which when ordered by the system results in a complete resolution of this dependency entanglement?
You are referring to asset exchange (not Ethereum's scripting). As
you have stated, only the consensus mechanism can choose between the plurality of partial orderings because the partial orderings are arbitrary (and in the presence of competing double-spends, the partial orderings are conflicting). Thus Nash equilibrium depends on the consensus mechanism not being gameable which is the point I was making in my Edit#2 of my prior post.
I am interpreting your posts as
you continue wishing for some sort of absolute, structural synchrony which can't exist in distributed systems. Did I misunderstand your question?