I came here to say that. Though not in a bad way; the economics of what is possible but practical/impractical changes greatly with LLMs, and I suspect and hope we will be figuring out the ramifications for a while.
Agreed... I suspect we're not too far off from being able to say "port this Win16 application to Win64" if we're not there already... and most of it will be harness improvements!
My first guess (and probably the first guess of many of the old school nerds) was that the MS Word codename is from Opus the penguin from Berkeley Breathed's Bloom County comic strip and that seems to be correct.
Not to be confused with the Anthropic LLM model Opus - what was once an old codename is as good as new once again!