Early GEM allowed arbitrary window sizing and positioning at least within the file manager, and Apple thus sued them, because they felt they had exclusive rights to ideas that they stole from Xerox

Also, the Amiga had the window management you refer to in its earliest versions, in 1984. Amigas cost a hell of a lot less than $15,000, even packed to the brim with expansions. I grew up with the Amiga, so your assertion that "No one was doing it in the consumer space, no consumer knew about that stuff, Linux consumers on their 14" 800x600 monitors sure hadn't see it." is anecdotally false.