That's because everyone has their own opinion in regards to handling "difficulty" and "depth".
Brutal should appeal to the hardcore elitist that desire scripted fights where you need encyclopedic knowledge to do basic functions where everything one shots you if you can't do the perfect dance. Difficulty is high, everyone needs a near BiS set to compete, rewards will be given once you complete all of the fights by the end of the week. All players that complete all turns are given the chance to get the Brutal set. (Think of the Primal Focus quest)
Normal coil should appeal to the progressive mainstream player. There will still be one shot mechanics and you'll still need to follow rotation but it will be doable as time passes by with gear (No echo until the next major patch). Grants the Normal Allagan or High Allagan set piece dedicated for that content.
Easy mode coil should appeal to the casual and progressive player. Echo can be applied from the start at the cost of a treasure coffer (until the next major patch). Yet gear is that equivalent to the token gear. In our current case that would be the ilvl 100 Weather set and the weekly lockout still applies. Also the drop rate to upgrade the weathered gear is much lower than normal coil.
Whichever version you do you'll be locked into it for that week. (until it gets removed and put on DF which only applies to Normal and Easy mode.)
Personally I wouldn't want it to come to this but it should be an acceptable compromise to even the hardcore elitist.
Because elitists hate the notion that you can do something you wouldn't be able to do otherwise because unlike the people that cleared it you didn't "work" for it. Then again the notion is hilarious since they use videos and guides for everything. Yet the team is catering more and more to the hardcore elitist crowd than they are the rest of their player base and Final Fantasy does kind of have a reputation for their design approaches to end up very grinding and sadistic in nature, no offense Square-Enix.