Why GPT-3.5 Deprecated? And what will happen now?

An ability that the Legacy GPT-3.5 model had was the ability to number it’s responses. The “default” GPT-3.5 doesn’t have this capability, but the ability is retained in GPT-4 from my experiments. Roughly what I was doing was asking ChatGPT to number each of it’s responses with “01” then “02” etc. I then could tell it to refer to the response number 12 for example and elaborate on that answer even if I was already on response 23. When not using this approach I noticed ChatGPT would be unable to elaborate on a previous response because there was no context. Anyway, ChatGPT should build that into the model by default in my opinion.

Where can I add that as a feature request??