Big time.
Barzal doesn't strike me as the all blood, sweat & tears guy. If one hits him a couple of times and is in his face constantly, there won't be any miracles happening for him. He becomes very pedestrian.
If there's one thing that impressed me about him, beside the raw speed, is that he is one of the hardest players I have seen at trying to try to get himself space from an opponent in the offensive zone. He is always in CONSTANT movement, trying to create that 2-3 feet of space for himself that allows him to have that extra half a second in deciding what to do. Everyone tries to do it, but he is very good at it.
Then, it's not a surprise that when it's time to defend, that fairly often he goes into gliding mode: his energy is mostly devoted to offense.