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S/MIME has two problems: it’s harder to get a free certificate (Let’s Encrypt for S/MIME could really help here) and, AFAIK, it still technically is not using modern cryptographic cipher suites (e.g. no AEAD).

It would be cool to know these problems are being resolved.

FWIW in my experience S/MIME is also quite well supported in e-mail clients. Additionally due to centralized CA nature there are no questions whether the certificate is good or not.