I totally get what your saying. But the thing is, you have to look at it from SE's view and not the players.
Option A: Make an easy-to-grab loot system, people run through content quickly, weapon drops are more beneficial, Ifrit becomes new Darkhold which no one really tackles anymore.
Option B: Force current players to grind out the one piece of end-game people can find to be useful (the weapons have a much better reputation than U/U Darkhold gear.) Allowing content's life to be prolonged.
This allows them more development time and they won't be plagued with more "There's nothing to do at endgame." complaints. I know it's not ideal for anyone, but it is what it is and I completely understand why they took the route they did.
Not to mention, Darkhold and Ifrit are two different types of systems. One is an easy-access dungeon, which has several chests that drop a specific piece of loot, and the potential for multiple boss chests with multiple loot options. The other, you have to grind items for your chance at loot, there is no dungeon to navigate, and you're thrown into the fight immediately, in which a chest drops for each individual player, and you have a shot at a random weapon.
They are essentially as time consuming as each other, just processes.
I disagree with your stance here. I don't see how it's unfair, as everyone has the same chance. So it's not lop-sided. The one argument in that favour is that some people have more 50s so they can make more use of the situation. Well, to the victor go the spoils. They have put the time and effort into raising those classes and are given more options because of it.
And not doing the instance again is fine for you. Get your achievement and be done with it. However, the body count outside the instance tells me that everyone else is finding incentive to repeat the process.
I definitely don't want tokens to be apart of it, because again, the shelf life will deteriorate faster if you have the option to take what you want. At this point, people still need weapons from Ifrit. If your option was in place, everyone would be finished with the encounter already and the Ifrit Aetheryte would look much like the Darkhold cave does now.
Like has been stated, the loot system will be adjusted. You can come back and try to grab your weapon at that time, or grind it out now. I don't see the problem with that. People with the drive will get their weapons, people who don't have the drive won't. Which is how it should be. Not everything should be handfed, some stuff you should -have- to work for.