Excluding masks 7 and 8, they are actually aperture masks and produce a different TVL look with different resolutions. Ofc. modern LCD, OLED… technologies have their own quirks (subpixel spacing…) so they come in different flavours.
Sony trinitron TV’s had RGB aperture masks and different TVL and mentioned masks are aperture type, so maybe this answers your questions.
You can also use then for slotmask setups and some of them for shadow masks (with shifting).
‘Creator intentions’ are regarding aperture emulation different TVL ratings and different subpixel spacing setups.
Masks 7 and 8 (BW) are something to be used if they look better compared with some “RGB” masks, like with some displays with strange subpixel layouts, rotated games etc.