The thing i think a lot of people completely glaze over is this is FFXIV; a game that not only allows but encourages you to play every class
at the rate this quest goes it will be an all consuming task to keep up anything more than a single one when someone could potentially want all 12

the way it was done for the first ones was just about perfect it had you doing a bunch of interesting things and you got a top end weapon.
Then the time consuming 3 weeks to upgrade to zenith didn't actually take too much actual time and involved high end content you would want to do anyways

it got you into the weapons and then the maintenance of keeping it up was the grindy stuff

It never mattered if it wasn't super time consuming because you have so many classes to do it for

Another thing I feel is worth noting is if they have a need to bribe people into doing content, the content itself is the problem and should be looked at.
Old content should not be a requirement either, doing it for no reason than "the quest told me to" is pretty silly
the level 50 dungeons actually have decent pop times in the duty finder anyways and didn't need to be boosted

they could have very easily done something more streamlined

exploration: go to this area and search for a base item
fates and hunting: go do a fate in each HW zone for a drop and hunt some A rank mobs in HW zones for soul energy
dungeons: do a few HW dungeons for items that drop off end bosses or are sparklies to interact with
trials: fight a boss or two like the hydra fight
have some solo things woven in like how story driven instanced fights and world fights occur

etc etc like so, most importantly no RNG. You do the task and you get credit for it

The point is to make it feel like your doing some heroic questline
as it is now it's like "dig a 6 foot deep hole with this garden trowel, now dig another 6 foot deep hole, now fill the first hole with the dirt from the second and the second with the dirt from the first"