Don’t get me wrong, ADFS is great. But it is also a technology with a long history and can (in some cases) be replaced by a better and easier technology...
Puzzling why language can not be changed in M365 Portal for synced users?
Azure Meetup Bonn (10.06.2021) - Azure AD Connect - Schaltzentrale der hybriden Identitätsinfrastruktur (German session)
Dealing with critical user accounts