as you say, tech enthusiasts only _talk_ about interoperability, but very very few actually care about it. Try interoperating between two pieces of code written in two different languages without spinning up an HTTP server or a separate virtual machine with a database system. Not even two different languages, just between two major versions of the same damn programming language.

I think you're missing the point that the "G" in WYSIWIG is "when printed". Everybody wants uniform rendering across applications in the way that, say, websites render uniformly across browsers. But fewer people care today what it looks like when printed--they're never going to print it anyway. They're just going to docusign it and call it a day.

In other words, fidelity to the printed page isn't really as important or as magical today as it was in 1984.