...I’m leaving it behind because I honestly believe that it no longer holds any value,
Would disagree pretty strongly. I was a longtime KDE user and was scared witless of lightweight WM after a few failed attempts back in the day. #! gave me a lightweight distribution that worked OOB and gave me a usable system; I felt free to backup configs and tweak to my heart's content, knowing I could always put it back the way it was if I screwed it up.
That's how I learned openbox. That's also how I learned that I preferred fluxbox to openbox.
Then I figured one day that since I had a really nice #! configuration I could migrate the thing to full Debian. After that I learned that migrating a #! install to Debian isn't as easy as one would think, but I got through it. That gave me the confidence to clean-install Jessie and later, Sid which is where I am now.
But I'm still using the default #! theme
corenominal saved me a lot of pain and I learned a lot. I'm not sure there really is anything to replace what #! is out of the box.