It is not stalled, but as it currently stands, Henrik is bottleneck. He used to work like a fiend, but obviously its not sustainable for one guy to keep carrying on for something with as large scope as an Emacs distribution.
There are plans to split doom-emacs' core and contrib modules in separate modules, but no idea what the progress is on that.
I would argue very few of those commits are feature commits of late. Once again, I am deeply thankful to Doom Emacs, and in no way 'demanding' anything from the project.
Actually, in the last few months there has been an absolute ton of feature work. A very sophisticated generational profile system was introduced, and the entire framework is being split into separate packages to enable more stable versioning. This is all with the goal of reducing the bus-factor from being just Henrik.