What the poster meant wasn't that the LLM itself is an entity with a preference, but simply that because of the training, LLMs are better at doing stuff in a standard Linux environment. If you have to teach it a new environment it either needs to waste time and context every time to look up stuff, or you need a company to do RL to teach it that new stuff (unlikely).

It would probably help if the sandbox presented a linux-y looking API, and translated that to actual browser commands.