I get leather seats due to my polyester allergy. That may be an unusual reason, but it's very important to some of us to have the option of something we're not allergic to...
That's because they're polyester. So completely on the no-no list for me.
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Polyester, which I'm allergic to, or cashmere, which I'm not allergic to? Cashmere. (Nylon is rarely used for sweaters.)
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I'm just pointing out that the practicalities sometimes point in directions you might not think.
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My favorite chairs at home are actually hardwood, but I don't think an unpadded hardwood seat has been offered as an option in a car since the 1920s.
Same preferences here. I do not really care much about the finish, but I do need leather for the same (health) reasons as you.
Cloth finish gives me sneeze attacks (dangerous during driving)
Polyester or similar plastics finish causes allergic reactions