Agreed, but the point the author is missing is that complexity doesn't exist due to deliberate corporate lock in, but because the product is 40 years old and has had 10-11 ways to do just about everything it does. Unfortunately, as your case illustrates, there are still documents in the wild that depend on these legacy features. So to render with 100% fidelity, you end up in a sprawling web of complexity. Microsoft can afford to navigate that web (and already owns it). It's neigh impossible for an open-source product to do so.