HURD isn't unfinished, it's a zombie project
From the article:
It is arguable that in the sort of narrow, specific sense that Stallman himself tends to favor, the GNU Project failed. There isn't a complete, working GNU OS. An operating system is a stack of components, from the visible user-facing stuff to the kernel, and the GNU kernel, the also recursively named Hurd, is still incomplete and not ready for daily use, even after all this time.
It's not really fair to characterize HURD as an unfinished project, because nobody's really expecting to finish it anymore. The FSF's own tediously comprehensive GNU/Linux FAQ and/or harangue even admits:
We expected to release the GNU system packaged for installation, but this plan was overtaken by events: in 1992 others were already packaging GNU variants containing Linux. Starting in 1993 we sponsored an effort to make a better and freer GNU/Linux distribution, called Debian GNU/Linux. [...]
The GNU Hurd kernel never became sufficiently ready; we only recommend it to those interested in working on it.
Their user-facing recommendations exclusively promote use of the GNU system on top of the Linux kernel.
HURD is only still a thing because the entire kernel project became a manifestation of the sunk-cost fallacy. The FSF continues to develop a dead-end microkernel that will never be usable, simply because "Given the years of work we had already put into the Hurd, we decided to finish it rather than throw them away."