Clarify why we don't use qualified names #8151

Job	Run time
mingw (ucrt64)	4m 20s
mingw (mingw64)	4m 9s
build (windows-2019, Win32, v142, 17, Debug)	1m 33s
build (windows-2019, x64, v141, 17, Release)	2m 52s
build (windows-2019, Win32, v142, 17, Release)	2m 20s
build (windows-2019, x64, v141, 14, Release)	2m 27s
build (windows-2022, x64, v143, Debug, 20)	1m 58s
build (windows-2019, x64, v141, 14, Debug)	1m 58s
build (windows-2019, x64, v141, 17, Debug)	2m 2s
build (windows-2019, x64, v142, 17, Debug)	1m 39s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 22s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 45s
build (windows-2019, x64, v142, 17, Release)	2m 33s
build (windows-2019, x64, v142, 20, Debug)	2m 9s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 27s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 9s
build (windows-2019, x64, v142, 20, Release)	3m 34s
	41m 17s

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