'Cause you actually had to grind to get those sets. Y1 and Y2 Solstice required glows to be purchased to actually make your armor glow(the armors had an exclusive ornament glow socket). Y3 Solstice changed this by requiring only the Majestic Set be unlocked to purchase the glowing variant of the Majestic Set. This variant was a Universal Ornament that would change colors depending on equipped subclass instead of having to manually change glow piece by piece. So the only set they could bring back is last year's, but the static white glow version is exclusive as it is not a universal ornament(at least not until transmog)but unlocked by completing objectives. But I doubt Bungie will be bringing it back.