Sure, but (again...) that's a pretty clear break from "you can literally use totally, absolutely, 100% unaltered PHB options," which is what numerous people were specifically saying 5.5e would be. "D1D" (or whatever we choose to call it) is not "small tweaks and class errata." It is, in fact, changing some fundamental level stuff. You will be expected to either adapt old content to match the new rules, or expected to not use that old content in the first place. Which is the whole point I've been making, restated several times, and people keep pushing back on it while implicitly saying things that agree with it...