Well, right now we have ex Anthropic employees telling the media that their terabyte sized models can possibly copy themselves onto the internet and run elsewhere as if the necessary computing resources are ubiquitous.

Plus, "we must pace the frontier" implies that the argument is that the frontier is moving too fast, but if RSI can't move faster than the rest of reality and the models needed for RSI are already nearing the limits of current human reality, RSI can't move much faster than we can improve reality.