Exactly. Never ever had either rolling or boosting cancel a stun that landed, but a lot of times I manage to roll out of the way just a split second before the kick lands, I guess that with lag it shows up on my opponent screen as their stun landing and me breaking out of it.
They aren't, d-bash lasts too short. That's all that is happening. It was shortened to prevent stunlocks and now it doesn't even serve its purpose for it is too short.