I find the article light on technical justifications and examples.
For example, the phrase "by giving users and programs as much control over their computing environment as possible" deserves to backed. It can be noted that users can develop and run their own file system, networking stack, and whatnot without (1) requiring root privileges, and (2) compromising or otherwise interfering with the system. Sadly, the conclusion of the article (that GNU/Hurd is for "for developers who want to dig deeper into system development") dismisses this aspect.
Likewise, an illustration of features "that users have actually always wanted but never dared ask their administrator" would have been welcome. It could be mentioned, as an example, that mounting an NFS, FTP, or ISO 9660 file system (or anything else) does not require root privileges.