Only 2/5 Endgame content currently viable, why?

[Viridiana]

Canopus Shield has 122 block rate which is the highest in the game. Can't beat that with any materia.

Revolutionary's Bilaud is nice for CNJ Int : +5, Mnd : +5, Pty : +5,
Magic Accuracy : +4, Magic Evasion : +4, Parry : +4.

Yes, you can beat that with materia, but it's still good.

Canopus Shield does indeed have the highest block rate, and, indeed, you can't buff that any higher on other shields with materia. . . but you can boost defense or HP. Although, hey, if you need a DPS shield, that +2 STR is on there (lol DPS Gladiators). . .

As for Revolutionary's Bliaud, that's not Batraal gear. You can get that without fighting a single enemy in the dungeon.