To me it is a lot like playing a dps who is reliant on CDs. Overall it is pretty much a rotation + a Taunt + CDs for certain abilities.
Like playing dps and waiting to use CDs when you have the best window to get all the attacks in you need in the CD to boost damage. Progression is all about knowing the fight and learning to ignore mechanics that don't have anything to do with you.
I always try and boost my DPS as well, but after progression I go hard on DPS. Mostly to help contribute still besides just making sure the boss doesn't walk over and cleave someone in half. It can even be kind of fun to try and go hard on DPS. I like to set little DPS goals, like hit a Million dps on this fight or something like that. Mini games with myself. Sometimes a tank and I will dps race on fights where it can actually be done (ie one tank isn't off running around for extended time while the other is on the boss mostly or one gets all the cleave)
The biggest issue is on fights like Vari, where you can accidentally zone out tunneling basically and miss a taunt cause you're getting bored. Like a dps where there is nothing for you to move out of because of the fight design. So you tunnel out by accident and that one thing that happens every now and again you totally space on cause your thinking about something else and running on muscle memory. So it is unforgiving when you have a tunnel moment and fuck up.
I also attempt to lead DPS to their death when we are doing farm content. Like on Kingo I'll Spell Reflect (for safety) and walk through the Beam and sure enough sometimes a sleepy dps will follow me like a fool and get melted. No one cares it is farm and we are going to down him anyways. Shit like that. Depends on your guild if you can add flavor this way. We have a lot of priests that pull people around that kind of stuff. Adds some fun to the boredom that farm can become.
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Eh I think raid lead from a DPS perspective is the easiest since you can see the field a bit better and all your movement is on a timer anyways for all roles. Tank normally your field of vision gets impeded pretty badly.