While most people will disagree with me, I approve of the current coil looting systems. It creates an interesting dynamic where it rewards players who can play their class correctly with what has been given to them and punish those who cannot. Even though RNG does play a major factor into it, you have always provided a good combination of non coil gear to help fill in the holes of the missing coil gear pieces. I think this is a good method of testing players ability to coordinate gear in end game situations. Some players may have the impression that you NEED a certain piece of gear, but BiS isn't always necessary to complete the content as was shown by BG clearing SCoB so fast with low ilvl players.
Is there a planned arrangement for this in the next coil?
For example SCH gear is good to be purchased on the left side whereas the accessories are better as coil but it's not going to hurt to use the accessories and vice versa for the WHM. Similarly for other classes as well like BLM and SMN. Is this planned in advanced, and will this occur for future content?