The Pro python window is a different beast.
Anyway I am on Pro beta 2, and ArcGIS Pro 2.3 is coming on Jan 18...
I think add results to "display"/"map"/"Whatever" was just added back in
So I can't confirm your problem, since it doesn't exist for me now.
There is a recent video showing "What's new in Pro 2.3" that shows some of the other cool stuff.
So you can wait and test then... or keep trying to find a workaround that doesn't entail creating a featureclass, then a featurelayer on disc