They were the original battle armor with mag clamps. The CC had no omnimech production at the time of their development.
Didn't mass production of the
Men Shen OmniMech (3060) predate production of the
Fa Shih (3062) by about two years?
I would say it's more that the CCAF had limited homegrown OmniMech production at that time, so
Fa Shih helped bridge the gap. The CCAF was importing several other OmniMech designs (
Sunder, Avatar, Black Hawk-KU, Blackjack, Firestarter) before they started production of them in the mid 3060s. We know that the CCAF conquered the St. Ives Compact in 3063 (just 1 year after production of Fa Shih Battle Armor) which allowed for domestic production of those OmniMech designs.
I think what's interesting is that Capellans can use Fa Shih on mechs mounting Stealth Armor, so the Capellan Shadow Lances get the benefit of carrying along mechanized infantry like a lance of OmniMechs.