I personally, I'd agree with the Taiwan thing in isolation, but this last minute decision is clearly intended to put Biden in a bind: reverse it, and he pisses off Americans who reasonably have favorable feelings towards Taiwan; keep it, and diplomacy with China gets a lot harder.
I'm speculating, but my guess is the Iran thing is meant to throw a wrench into any attempt to restart the Iran nuclear deal. Also, note the Iran thing was actually nonsense about Al Qaeda, not Iran's own conflict-stirring.