Keycloak is indeed a great product and more feature complete.

We are currently focused on refining the SAML SSO integration. We abstract away SAML login as an OAuth 2.0 flow so that it plugs in seamlessly where a Google or Github login (for instance) would in your tech stack.

That's an opinion, not always true for everyone. I love Keycloak, but I've seen several large enterprises trial it and give up due to complexity at their particular scale. I've seen bigger orgs use it successfully in a simpler tech landscape.

Regardless, this is a solution for your application that doesn't require running something like Keycloak. If I was developing an application I'd be looking at this, Auth0 or WorkOS to get the features my customers are demanding. (SSO/SAML/OAUTH mostly). Keycloak does the opposite, as a business I could deploy Keyclock to be my SAML IDP, but still need my applications to support SAML.