Apple Mail's implementation was broken for years, it silently failed to encrypt messages (CVE-2023-40440). It also still can't properly sign letters with attachments.
None of these implementations also handle RSA-PSS signatures and the standards basically forbid double-signing that would allow gradual migration to better algorithms. (This issue also exists with PGP/GPG)
Actalis is nice for testing but they unfortunately generate your private key for you instead of accepting your CSR. (Protonmail has the same issue with PGP.)
But it is better in a bunch of other aspects, including tooling, yes.
None of these implementations also handle RSA-PSS signatures and the standards basically forbid double-signing that would allow gradual migration to better algorithms. (This issue also exists with PGP/GPG)
Actalis is nice for testing but they unfortunately generate your private key for you instead of accepting your CSR. (Protonmail has the same issue with PGP.)
But it is better in a bunch of other aspects, including tooling, yes.