The only way this could work is if Coil was included in the actual Main Story Quest line and everyone was forced to do it. Then you could do what's currently done for Primals, in that you've got a Hard Mode which is pretty much a cake-walk and then the Extreme version which is the actual fight that gives loot.

If Coil isn't forced onto the entire player-base then there is zero point in making a story mode for people to do. Either you'll spend the time to actually finish the fights (4h at most to learn T5) or you'll realize the effort isn't worth it to you and you'll go watch the CS's on YouTube.