Loot/dungeon lockout is just a reality for players to deal with. Players always want the best as fast as possible, but it's simply not possible for developers to keep up with the insatiable demand of players. So they implement lockout systems to stop players from making the content obsolete too quickly. Fair enough.

But the way it's done right now is quite bad.

For Coils, to optimize your progress, you have to go through each turn, step by step. And once you go up, you can't go back and help your friends. So you get a community mismatch; You can have 500 FC members, but you're best off doing a static if you want progression.

For Crystal Tower, you get one piece for the week and you're done. This leads to many players passing on loot that they put at a lower priority, and just a general waste. Also, very little incentive to go back once you got your piece for the week.