[jsmthrowaway]

In what sense? An attacker can already see the endpoints of a TLS conversation, and worrying about hostname disclosure is security through obscurity; the client already divulged the destination hostname with a probably-cleartext DNS query, too. Not worth worrying about. SNI is fine. If hostname disclosure is a security threat, the system needs rearchitecture.

Systems that hostname their customers (mycompany.example.com) should use wildcards for that scenario instead of SNI, among other reasons. That’s the only possible concern I can imagine.

[jakupovic]

Wildcard certs work only 1 level deep. If you introduce regions and stages or other dimensions you would need multiple wildcard certs to cover e.g. SVCa.teama.region.example.com

Multi domain certs help but then you need to encode all the names ahead of time and if you miss a name you need to reissue and reapply the cert.