I haven't used Authentik myself at all; Okta at one place I worked, but that was managed by the ops team so I didn't have much to do with it.

Committing to LDAP is one thing; getting SSO is a whole other level of effort. Again, I have experience with LDAP so it seems manageable, and common enough to be worth setting up - does a large enough portion of OSS hosted software support SAML or OpenID or whatever to make setting up Authentik worth the effort?

I'll re-iterate, I do not enjoy ops. I do it only because it's slightly more important to me to have control over my data than it is to not have to admin stuff. I like lldap specifically because it's a single executable, one or two really basic config files (requiring a bare minimum of understanding LDAP to configure), and one SQLite DB file - backing it up is, like, 3 files. This has huge value to someone like me, far exceeding the capability limitations of lldap vs OpenLDAP. If Authentik is just as easy, with minimum external dependencies, then I'm interested. If I have to install, configure, and administer and maintain PostgreSQL, redis, and a half dozen other external dependencies... then my family can live without SSO :-)