I always assume people use daily either mac or linux. I am always genuinely surprised when they mention they use windows. I live in a tech bubble where unix is the norm, and I find instinctively strange otherwise. Then I think about stats, and I remember we are the exception
Definitely the first. I work in ML, and I find for instance people with background mainly in c# to be the least fit for my field, particularly if they have long experience. So I understand this kind of requests