Windows Server 2016: Mainstream support ends in 6 months

[German]A breif information for in between: Are you aware that the so-called mainstream support for Windows Server 2016 will already end on Jan. 11, 2022? From this point on, this operating system will still get security updates, but no more bug fixes and improvements are planned by Microsoft. According to this document, however, Windows Server 2016 will continue to get security updates until Jan. 12, 2027, when it will drop out of support. By the way, the product was released on October 15, 2016.  I assume that the mass of installations are still with Windows Server 2016. Are any of you switching to Windows Server 2019 as of January 2022?