This is a Duplicate of ArcGIS Pro Publish Services To ArcGIS Server
Now you can NOT publish from Pro without federating with Portal. Federation is optional. I have two reason not to federate at this points.
1- We have a third party software that partially meet proper federation recommendations, 2- we have ArcGIS Online that is devoted to the public and I want the services not show on Portal. When you federate you see all. I want to manage organization services only in portal and I do not mine adding the item and creating may maps for editing and more.
I just want same option as ArcMap now.