I think the Dr460nized Blackarch spin has a really good potential, since I know many pentesters hesitate to use Blackarch because it's "harder." So I think Garuda can really push it to that audience of Debian users who are a bit gun-shy.
However, Garuda dr460nized is a robust desktop, to say the least. Pentesting distributions are traditionally shipped with Xfce as it's simple and modular, and works well out of the box on most configurations.
I've successfully compiled an Xfce-blackarch image and would like to offer to add it to the community editions and maintain it, if that is something the community is interested in.
I did add FireDragon browser back to this build, along with Firejail, as a "secure browsing" suite
Let me know if this is something you would use/know someone who would.