Then please start grounding your arguments in some practical sense!

>If I grep a file over and over again it’ll be long time before the universe affects the components enough to result in a different output.

Or a ram flip will effect it 30 seconds later, but I get the gist of you're describing a non-determistic process.

>If I ask an LLM to do the same thing twice it will do it differently.

If I ask a human to do the same thing twice there are a few possibilities. 1. they copy their old work and present it as their new work. 2. The process is very simple and follows a few basic steps with high repeatability. 3. They'll have learned from their other attempt and do it in a more optimized fashion. 4. They will have forgotten how they did it exactly and reproduce something that looks somewhat like what they created the first time.

Also, LLMs run with a temperature to help avoiding minima/maxima of supplying the exact same answer, this can be reduced to 0 and that makes any one response to a fixed prompt similar if not the same. When you get into agentic tasks with their own history it develops it's own "flavor" of doing things.