I mean, did he use analog equipment even as recently as Split? I believe you that he used it in 2006; he had a ton of clout back then and could probably get away with whatever quirkiness he wanted. (Also, I've long heard, through the production grapevine, that regardless of how one might feel about the final products, his movies are apparently really, really great to work on on-set. We crew folk will indulge quite a lot of quirkiness if the meals are on time, the OT isn't too brutal, and the "adults" are level headed, smart, and don't blow a gasket over dumb stuff.) Split, by comparison, I think was in the $10m range for total budget, and I would think that he could not have indulged himself in that way.
Regardless, I've been meaning to rewatch Unbreakable for a while now, and I'm a guaranteed ticket buy for Glass. But be warned, if I've got any curiosities about the image after the fact I'm coming straight here to pick Jason Myres' brain.