Why would you want to cut the bit with Kylo’s mask?
Mostly because I thought it made sense thematically for him to lose the mask when he kills his father. (And it’s never shown being recovered from the catwalk.)
I was willing to let that go when I found out he’d have the mask again for TLJ, but then it turned out he only had it…so that he could get rid of it in his first scene.
I understand the thematic purpose behind this, but think the same message is gotten across with Snoke’s dialogue, and I think getting rid of the mask in TLJ altogether won’t be all that much work, and the important dialogue can be preserved.
The mask was more for his reverence to Darth Vader, who he wanted to be. So I don’t think after killing his father changes that. Plus, as other had said, it adds more to the scene with Snoke calling Kylo out on it.
Granted I agree the assumption for the audience is he didn’t pick up the helmet … unless he made more than one? Has a few spares in case he breaks one from a tantrum of his? 😉