Why do people want SAM to be a tank!?

[Shippuu]

haven't seen it, but it doesn't look like tank - drg looks more like tank, in multiple gear-sets.

Haven't seen it? Then maybe don't make blanket statements? How it looks doesn't change the fact in the series and it's fictional MMO, the job is a tank.

Plenty of MMO's have tanks that don't look like tanks (WoW's Demon Hunters, Monks. SWTOR's Sith Assassin/Jedi Shadow, Rift's...everything basically, rogue and mage tanks etc.) FFXIV's future tanks don't have to look like tanks if SE doesn't want them to, even then, Samurai still makes perfect sense to wear Fending armor still.

Even tanks in this game don't always look like tanks. DRG's lore set looks more like a tank than the actual Tank Lore set.