I would love a safety net system that shoots tendrils through the whole game one idea was trying to get two systems into one:
I thought we may get us two chocobos one quake was perhaps a combination of glamour log and item safety net.
The basic tl;dr was you could break down every item into their content name materia / crystalized aether form. This in and of itself would provide some aside convinces like perhaps allowing crafting materials from dungeon dedicated FROM that dungeon, but also nice things like being able to do seal runs (for like GC) and combine everything into one token on the fly. Run a content a whole bunch changing them into "totorak essence", come back after a few hours with only ONE slot used earn yourself like 10k GC lol. But more particularly to the point there would be this lore friendly space, I was thinking Hydalen influenced but maybe that wont be good for the story, it could be some internal mental space (which could come with some neat other features, building up your own mental area palace :3 - maybe chrono trigger end of time vibe, place with the lamppost and old man). In this location, which I called the cyrstal library, you would be able to turn in X essences to unlock the tome for that content. So say ifrit, turn the weapons into essence (and also no need for primal tokens anymore, they too could just be essence). After you turn in X essence you unlock the tome of ifrit, which gives you ALL the glamour for that content, and gives you a discount at your aether forge. Aether forge would take Y essence to create an item from that content, the cost based on if you've unlocked the tome yet. So like buying ifrit claws when it's unlocked might be 3 essence, meanwhile locked could be 10. One nice feature SE can use for this is the cost adjusts based on if it's current content or not, so if it's current it could be like 99 to unlock the glamour, and the forge is like 10 minimum unlocked, 20 locked, then when the content gets old and irrelevant the cost might be cut in half. If you wanted certain items to be worth more because they were rare you could have them convert into more essence or you could utilize the HQ system (so it's like 20 NQ, 10 HQ - though I think just using rarer items being worth more and having the cost adjust would be better as it's less space consuming).
Now you'd have say a content that has 30 items of unique glamour turn into a single variable of yes / no. If you don't allow partial turn ins then it certainly saves a lot of space (or if it's tracked via a quest, such you can do partial turn ins but it takes up quest memory which is already allocated to each player (up to 30 quests)). Because the order of these variables are set you might even be able to achieve some other nice tricks to memory usage, as well as organizing out the glamour chest to utilize how this is separated perhaps to help encourage reduced stress on servers when you open up the log. There still should be some loose slots, like we have currently, to help for players who only want ONE glamour from a content or there are strange situations where a content doesn't really have enough to justify making a tome out of it.
Getting such a system, any system that is more complete glamour log honestly, would temporarily reboost the value of old content a lot (and also probably impact the value of items that desynth from them since you'd be choosing between glamour or economy).
I think it's nice because now there is a safety net while also still having that flavor of RNG so you might get lucky and get that lucky feeling but also you're not going to be hopeless, it adds an overarching collectors goal to most content, allows us to perhaps hopefully have much larger glamour logs (by reducing 30 unique items that fit into slots to 1 variable that has a specified slot for it already), may have other content shoot off from it (palace of solitude lol, though should either smoothly meld into island sanctuary or ensure they don't fight each other), may more easily incorporate content into crafting or other in game content (maybe island sanctuary gets an upgrade if you bring it a bunch of X essence), and I think lore wise it could slide in as if it was just a byproduct of the world and your abilities.