I non-sarcastically switched to Window Maker (https://www.windowmaker.org/) on my main desktop for a little while out of curiosity and was very impressed by the experience. I even installed GNUStep and made a crappy little GUI for an old software renderer I had with the Project Center IDE (http://www.gnustep.org/experience/ProjectCenter.html) which is surprisingly powerful and full of features.

Sure, it was all old and ugly by today's standards, and a big step backwards overall from the Plasma desktop I was used to, but it felt really good to use.

The whole GNUStep ecosystem is crazy impressive too, and idk the history around it, but I assume interest for it died off a long time ago. Which is a shame, because having that development environment on a modern (free as in freedom) desktop would be awesome. Objective-C gets a lot of hate, but IMO it's the better answer to a C successor than C++ was, as it's literally just "C with classes" and none of that other bloat.

But apparently development for GNUStep is still alive (last stable release was ~2 months ago), so maybe there is still hope that it will take off one day!