That's not the problem. Windows NT did have that right from the beginning. The problem is the second sentence, because it ignores that so too did Unix from the same timeframe. AT&T System 5 Release 4 had the Service Access Facility from 1988. AIX had the System Resource Controller from version 3.2. Other systems were not playing catch-up. They had this stuff too, at around the same time.
Benno Rice's explanation is actually ahistorical here. What actually happened is that the world spent a lot of time "cloning" existing Unix softwares during that time period, for reasons that we all known, and a lot of the time the clones were behind the times and did not catch up. By the time that Miquel van Smoorenburg cloned AT&T Unix init and rc for Minix, for example, what xe was cloning had already become years out of date.
Benno Rice's explanation is actually ahistorical here. What actually happened is that the world spent a lot of time "cloning" existing Unix softwares during that time period, for reasons that we all known, and a lot of the time the clones were behind the times and did not catch up. By the time that Miquel van Smoorenburg cloned AT&T Unix init and rc for Minix, for example, what xe was cloning had already become years out of date.
* http://jdebp.eu./FGA/inittab-getty-is-history.html