Photos will never be a viable replacement for the full Aperture professional use cases -- they have different goals.
Aperture might or might not run on HS (not sure), but holding to it until Photos catches up is not very good strategy, at some point it will just stop working (and it's not getting any new fixes, updates, etc).
I don't want to rent software, and I don't want to install the dreaded Adobe installer. What other good alternatives are there? Darktable doesn't pass the test.
I was an big Aperture user too, and put off the move a long time. I installed and edited the same photos in everything.
You either take the feature-set hit and switch to Apple Photos ( which does a great job with basic tweaks ), or you switch to Lightroom. Everything else is way below par. Your photos just won't anywhere near as good.
Personally, I don't want a "photo management" app, I want an app that is very good at batch processing, works over NFS drives, and doesn't use "projects" and "libraries".