You don't need an interface to just prompt and get a response from chatGPT it works pretty much out of the box with the API. I guess these interfaces make the interaction a bit more user friendly though.
Actually, people do. But it's not terribly fine-grained. SharePoint offers version control of MS Office documents and is used in many businesses as an improvement over shared drives and files named: Foo_Report_v3_FINAL_20210928_FINAL_DRAFT_FINAL.xlsx
I don't think you get branching with SharePoint, though.
I'm about to pitch this to my manager. We have automated manufacturing going through Excel. It allows the domain experts to tweak the manufacturing process without having to learn to code.
The price is going to make this a difficult sell. If it was one off at $1000 easy but monthly per user...