I think you strung together a bunch of words that don't jive with real world experiences.
Windows 7 still had some fundamental kernel quality issues. WDDM 1.1 wasn't mature to the point of providing a stable experience across the board and vendors were still adapting to the WDDM model; kernel mode printer drivers were still common, both a stability and security knock for those older versions of Windows.
So no, Windows 7 did not have "all of the stability" of Windows 10 or 11.
Windows 7 still had some fundamental kernel quality issues. WDDM 1.1 wasn't mature to the point of providing a stable experience across the board and vendors were still adapting to the WDDM model; kernel mode printer drivers were still common, both a stability and security knock for those older versions of Windows.
So no, Windows 7 did not have "all of the stability" of Windows 10 or 11.