Is there a proposed/hypothesized method by which GPT-4 _could_ be getting worse? THey won't have done a new training run, because that's hugely expensive, and t

Is there a proposed/hypothesized method by which GPT-4 _could_ be getting worse? THey won't have done a new training run, because that's hugely expensive, and they aren't going to be futzing with the model weights at random. If they wanted to save money, they could run it _slower_ but that shouldn't (as I understand it) change the quality of responses, just the speed. So, it seems to me that the model is very likely literally the exact same model it was at launch, so how is it supposed to have gotten worse?