Not sure what you think going back to the old style quill stem will do for you that isn't easier with the more modern threadless.

I suppose maybe you are having an issue finding threadless stems in stock. I had to search and wait, search and wait, then search and wait for several weeks before the stem I wanted finally was in stock somewhere again.

If you are finding quill stems more available and in stock, it's because way few people want them anymore.