Second this. SAML/SSO is less of an enterprise feature and more of an onboarding escalator. Even startups with 3 devs use SSO now.
I worked at a company that used Slack before they had SSO working. One person left the company and there was speculation as to reasons etc on various slack channels. Two or three weeks later, they piped up with one more "goodbye" in a public channel... and then actually signed out.