I guess not much has changed since 2008:<p><a href="https:&#x2F;&#x2F;pilif.github.io&#x2F;2008&#x2F;05&#x2F;why-is-nobody-using-ssl-client-certificates&#x2F;" rel="nofollow">https:&#x2F;&#x2F;pilif.github.io&#x2F;2008&#x2F;05&#x2F;why-is-nobody-using-ssl-clie...</a>