GNUstep has silently matured over the years but still lacks a real native window manager. Window Maker once aimed to be that but unfortunately didn't ever manage to fully integrate with GNUstep.
Fully porting Window Maker to GNUstep would be a Win-Win situation for all involved parties: GNUstep already features Wayland support and also offers a theming capabality for which WINGs' hardcoded and thus unchangeable NeXTSTEP aestetics are no match. So replacing WINGs with the GNUstep framework would instantly provide Wayland and more advanced theming support, for free.
People interested in an integrated Window Maker centric system based on Debian/Bookworm should have a look at https://wmlive.sourceforge.net and https://sourceforge.net/projects/wmlive/files/ for downloads.