Apple will be removing the deprecated services in a future release of macOS Server, so the writing is on the wall — it’s time to start researching alternatives.
I would be more upset if the Server App was better – either more intuitive or more configurable. As it is it’s a middling neither mess. I’m a networking and security professional – getting a VPN running this this thing is absurd.
Apple is clearly getting out of the network business. It’s odd they are punting this critical technology.