related to ADFS 2016:

it would be great if we can force a specific authentication method at ADFS for a relying party. in general forms and certificate authtentication is possible for our users, but for specific apps only certificate should be possible for security reasons. adding certificate as MFA is not a good solution from the users point of view because they will be forced to enter first their credentials before they have to use a certificate (which is more secure than forms and because of this sufficient).

Continue support and updates for Advanced Group Policy Management. Our company uses AGPM extensively and would like to see future enhancements and support continued. If there is a replacement Microsoft product, it doesn't seem to be found.

Windows Admin Center is fantastic but we all manage a mix of Linux and Windows Servers. Add the ability to add Linux Servers, SSH over the browser, and a few basic items would be phenomenal (process list, disk info, file explorer)

If one can create multiple partitions, how does one recombine them?

The following document says "The Server FOD ISO image file is available on the Microsoft Evaluation Center or on the Visual Studio portal for subscribers."

https://docs.microsoft.com/en-us/windows-server/manage/windows-admin-center/understand/windows-admin-center

FDO iso image was available from the Evaluation Center in early October 2018, but it is not found on the download site of the Windows Server 2019 evaluation re-released in January 2019. Therefore, it is not possible to get FOD iso image unless it is a Visual Studio subscribers or VL users ?

help me to just click on a website to open it

Facility for firwall protections should be incorporated

This services makes Windows Server 2016 a toy, not a professional or enterprise product:

Xbox Live Authencation
Xbox Live Saved Games
Xbox Live Networking
Onedrive
Phone
Contacts
Maps
Mobile devices
Geolocation
Camera,
Radios (Phone,Airplane mode)
Wallet services.

Please add the option to install Microsoft Edge on the server.

2016 Server Core and Nano don't have the ability to add-windowsfeature smtp-server. I feel the SMTP feature would lend itself well to the lightweight nature of Core and Nano.

Noticed that in Windows Server 2016 TP5 with latest cumulative update (KB3158987) Ink And Handwriting Services feature is missing:
Get-WindowsFeature | Where-Object {$_.Name -like '*ink*'}
returns no results... Looking at the files on the disk drive (C:\Program Files\Common Files\microsoft shared\ink) it seem that feature is actually installed. Some applications which relay on this feature fail during installation/instantiation since they determine feature is not installed. There was not mention in the release notes of the TP4 and TP5 in which this feature is no longer present (it was still present in TP3). Please fix this or suggest a workaround.

Default IIS HTTPS settings should get a good grade on https://www.ssllabs.com/
If legacy operating system support is needed, that should have to be enabled on a per-site basis.

Enable Scheduled Jobs/Tasks in Task Scheduler to Run at Log off. Presently due to updates on Server 2008 and higher, against security risk, a scheduled task does not run when the user is logged off. Supposedly due to a "Session 0 Isolation" from the updates.

Ever since I’ve moved to the Skip Ahead builds (10.0.18214.1000 & the earlier one), MS-Word is reporting incorrect page # for the doc.

Here in page # reflected for Current & Total pages is incorrect.

how to move the file in network Server 1 location to Server 2 location by using forefile

RDP is already a feature. If you were looking to assist users that had an active session on a machine and could implement the Offer Remote Assistance from inside the WAC with a button push, it'd make life easier.