Should it be changed?

So before we start. An interaction that is current within the game right now is Azir's Ulti against Braums shield. When casting Azir's ultimate, braum can stop the wall dead in its tracks with his shield. Thus stopping any knock back or damage.

So why does Azir's wall count as a projectile into Braums shield? And on the same side Yasuo's wind wall doesn't block the wall.