Exhibit A :
https://eso-sets.com/set/war-maiden
Exhibit B :
https://eso-sets.com/set/silks-of-the-sun
At some point, War Maiden got a buff of 200 spell damage for a total of 600, while similar sets (Silks for fire damage, Ysgramor's for ice, and some set for lightning maybe) remain on a lower value of 400. Even Spider Cultist, boosting another sub-set of abilities, the destruction line, has a value of 600.
With Diamond's out of the equation for some classes due to a questionable "bug" fix, War Maiden proved a solid option for magplars. Silks could be a perfect fit for magdk, and maybe Ysgramor's for magden if frost damage keeps getting buffed. The issue resides in the low-ish 5p bonus value that is not in line with War Maiden, and we know you guys at ZOS love standardisation.
tldr: plz buff Silks and similar sets, it has a niche that really needs it