Are people getting worse at playing MMOS as time goes on? I mean having the option to mark sure for some encounters, but requiring it for trash mobs LOL, l2p noob...if I played tank I wouldn't mark mobs in general, the mob the tank is facing that's losing life, is the one you should be hitting.../
Doesn't work quite that way in this game due to how healing threat works, PLD tanks especially have to switch between the mobs to use their threat generating attacks to ensure all mobs stick to the tank rather than have one rush to the healer.

In many MMO's your statement is true, FFXIV forces tanks to actually work for their threat because everyone can generate a ton f it.