Part of the problem is that you're fabricating imaginary problems that no one is actually experiencing, and only to try to argue that the solution for this imaginary problems is a file format.
Does this sound reasonable to you?
That's a very strong statement. A less aggressive approach to discussion might involve asking for a concrete example of a problem rather than assuming bad faith argument.
Off the top of my head, and just spitballing, I would be more surprised if mature game devs or animation studios didn't want to version control pretty massive asset libraries.
Exactly the sort of thing I had in mind.
15 years is nothing to OS level codebases.
Or a gamedev studio that has been making various MMO's since the early 2000's.