... Because they got the tank right. They have created a tank class that you enjoy playing.
I always hated being the tank in MMORPGs their class were the most boring to me, especially in FFXI.

That is why I started FFXIV as an Arcanist and later became a Summoner, because they seemed the most interesting to me at the time because of their DoTs and since I always played the caster/pet controller type in all RPGs since the days of Diablo.

I recently changed class to WAR due to all the good things I heard and also since I wanted to feel needed (DF Adventurer in need), got it to lv 39 and I have to say, I LOVE MY WAR and MY TANK.

This is the first time I play a tank and I love it (since they can even do solo content with decent DPS) so kudos to you devs kudos to you SE for getting the tank class, just right and making it enjoyable.

Much love.