Not the most important thing on the field as things can be countered. It become then much like chess. Where do you put the tank. Do they have a tank? A lot of AV? How far forward should I go? Should I stay back for long range support? There are many roles a tank can perform. Though it seems that this opinion is in the minority so I shall be quiet about it.

It is not because it is the flavor of the month. Or that you cannot be stopped unless it is by another tank or a rare few coordinated squads. No it is about becoming the focal point. Every moment I stay on the battlefield supporting my team is another minute the enemy spends either trying to destroy my tank or avoid it. Much like the mass driver it is an area denial weapon. Used in support of a squad is a powerful asset not the end all be all of combat. It can push enemies from objectives even without firing a shot. The other team must risk their tanks as well to kill mine. So I may lose tanks or my WP are not at the top of the board. But that's not why I tank.

I play my tank almost like a logistics role. In support of the squad and the team.

I like tanks.

You don't have a choice.

Your opponent just escalated the conflict. You then either have to step up or back out.

You don't ever see EVE players ***** and moan because someone dropped a battleship fleet into a fight

So, I have to tank. Great?! Destiny here I come. Titanfall in march baby. Maybe they have sense.
Nope the opposing fleet either runs or it reships to counter that fleet.