Not possible is a bit of an exaggeration. I played with several respectable Taru tanks in FFXI. Sure, you had to have some pretty sweet gear to compensate, but not only could it be done, but it could be done well.
And in XIV it seems to matter even less, meaning that yes Taru tanks will be both cute and effective. :)
Aion: Laine, 42 Elyos Ranger - Zikel (Retired)
WoW: Laine, 80 Draenei Hunter - Arthas (Retired)
FFXI: Kito, 75 Mithra SAM/RNG - Bismarck (Retired)
Jamie, giving female MMO players a good name since 2002!