I found 1 Blast powder on top of Valor Mountain so it is possible to get through these as you would in Reborn.
That said, i'll just ask a question here since im talking about this now anyway,
Anyone know where you can find any more Blast powder? I've only found one in the game so far, but there are at least 4 instances of having to break mine rocks from what ive seen so far (now also including this case).