That being said, that's just my reading of your comment and I could be wrong, which is kind of my argument here. If I'm right lawyers don't care about your notion, they use language for something different than mere information encoding. Therefore they need tools that support their use case. MS Word (or word processors in general) might not be the best tool for that job, but it is good enough. Integrating a well trained ChatGPT into MS Word will help lawyers much more than any structured entry form ever could.
BTW, the LaTeX quip was intended to make light of the idea of separating content and style, which goes way back. Consider TeX' age. Your reaction tells me, you think LaTeX is a styling tool, which in a sense it is, and that's what it is about, which it is not. Hordes of scientists (and type-setting professionals) argue in favor of LaTeX (or other type-setting systems) because you just write the content in plain text. LaTeX takes care of the style. TeX files are also just markup and easily git'able. It does make life easier, but it is not as important as some people make it out to be.