AAD Connect can now be installed on Windows Server 2019 Essentials-

Windows Server 2019 Essentials includes new support for Azure Active Directory via AAD Connect.

LTSC support for Windows Server 2016 Essentials-

Customers currently using Windows Server 2016 Essentials will be supported according to the Long Term Servicing Channel (LTSC) servicing time-line. For companies with more than 25 users/50 devices, or companies that have potentially grown beyond 25 users, Windows Server 2019 Standard – and potentially the Datacenter edition – can provide more flexible deployment options.