I will repeat: Coil unsyched still does not has to be easier than any dungeon unsyched. Dungeon mechanics can wipe you if you ignore them, so can Coil - they're not different from each other. Coils difficulty came from meeting dps-checks (as in: not hitting enrage) while still dealing with more mechanics than the average dungeon-boss has. Now that Coil is and can be done unsyched a good chunck of those mechanics can be ignored, reducing it to about 3 or 4 mechanics in T11 (for example; we went over those a few times already, sadly neither you nor OP actually stated that "Yes, that is to difficult for me to do, it has to be nerfed!" - either ignoring what we told you or knowing deep in your heart that you're wrong about calling those "uber difficult content").
Even though I have mained a tank for the past 4 years and am extremly familiar with playing a healer aswell, I have to burst your little bubble: Tanks and healers are not more important to a run than DPS. Stop telling yourself that to boost your own ego at the cost of false information and downgrading your fellow players who enjoy dps. You're showing a lot more elitst attitude here than any of those toxic veterans who are telling you "If I was able to beat Coil, so are you!" - because your stand is "I picked the most important class so I'm the most important person here! DPS can go home!"
I've run dungeons without a healer or a tank before and I'll take a good DPS over a midcore healer or tank any day. As a paladin I can compensate for the lack of a healer. As scholar I can compensate for the lack of a tank by being the tank myself. As dps I'm skilled enough to tank and keep myself alive. Dont pretend that in a team-"based" game some classes are more equal than others...
I dont want to engage in this discussion with you again - you've said this nonsense before and you still seem to believe that playing tank or healer makes you more important than any dps-class. You are being rude and disrespectful again just to boost your own ego. You've placed yourself on a high horse without any right to do so. Please stop.