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.

Need windows media streaming service back for server essentials 2016

Unify All the System Center Agents (virtual machine manager, SCOM, etc) in one solution (for example: SC unified Agent) .Integrate the System Center Agent as a Windows Server Feature (like .Net, BITS and the like).

Some Products requiere Windows Media Services as a prerequisite for Installation (for example Exchange Server). Currently you have to install Dekstop Expirience to get these Services.

The downside of this is, that Applications which require these services are automatically required to run with a GUI (no server core support because of Desktop experience prerequisites)

You know, Drag & Drop is a useful feature.
It's annoyoing, that RDP does not support Drag & Drop from / to the remote session.

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)

It's kind of lame to promote Win2k16 RDSH then not include a modern web browser. Make an LTSB Edge browser, it can't be THAT difficult.

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.

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).

I currently use a Windows 10 VM with Remote Server Administration Tools to manage our servers (about 3 years running now). Would be super sweet if you put together a version that runs natively on Mac. Super sweet.

If Windows Server 2016 TP5 support "windows hello" feature? any declare or blog?

I installed windows server 2016 (14393), and then I can't use "windows hello" in settings.

this feature worked in windows 10.

In Windows 2000 Advanced Server/Datacenter Server, User could set very fine controls for all applications running or applications that will launch at specific time/interval.
User could set:
Affinity
Priority
Memory Usage
Other fine control settings

Newer Windows versions removed this feature called "Process Control app UI", I hope in Windows Server 2016 we can get this functionality back so user can set super fine control for each application / process / filter / directshow filter .. etc

Image from Windows 2000 Datacenter Server:
http://xi-networks.net/Windows2000Server/Control.png

When deploying an application through a collection in "required" state, uninstall button is greyed out. This doesn't happen if the application is installed through a collection in "available" state. We would like to have the uninstall button always accessible, no matter if the application was pushed in a required state or not. Corruption happens all the time and technicians need to be able to uninstall/reinstall all the time. Because uninstall is greyed out, they have to use the control panel instead, which defeats the purpose of using Software Center.

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.

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.

Ever since Windows server 2012 we have had printer driver isolation, but there is a need for print spooler isolation. This would allow for an individual spooler for a printer to be stopped and the jobs deleted without affecting all other printers on the print server. This could be done in a method where the main print spooler service spawns child instances for each print and then through an api you would be able to stop and start these child instances.

This days MFA is getting more and more popular so I was wondering why not add new feature to Windows family so when server boots Bitlocker could be unlocked not by network but by MFA
What do you think would this be even possible ?

Add an option to add the Store to Windows Server (for GUI installations)