Perhaps in general, but in the context of that very specific area that just wasn't their goal. Maybe they could have had despair consume one of them earlier in the story at Thavnair or something like that, sure.
I'd admit I was a bit tired of always dealing with ruins and relics of the past instead of a thriving nation. I want to see an Allagan or Ronkan empire that is still thriving, a thriving Doma that isn't just a tiny square that we salvaged, Monks that aren't just a few survivors remaking the art, I could go on but so often, it's just rubble and ruins as if we missed the party.Garlemald being another ruined City feels underwhelming
I try to remind myself that as a sprout I was excited to see Sharlayan in the Hinterlands only to find rubble, but was finally able to see a thriving version in Endwalker or that we have modern thriving civlizations like the Grand Companies, Ironworks or Kugane.
Island Sanctuary is one map, but as of 6.4 will have had 2-3 increases to the ranks (like Eureka had increases to the level). Additional progression systems involve the quests, the workshop system, gathering enough materials and buying all the rewards. There are rare animals to obtain for your farm (although not FF11 rare). V&C have rare minion drops and a mount. Both Island Sanctuary and V&C have special actions similar to logograms.
Obviously we get that with Hildibrand now and it's much quicker. Special effects on armor seem to have happened for the raid armor instead.There is relic weapon progression for all of these maps
You can sell V&C minions or crafter and gatherer materia from Island Sanctuary for a good profit too.You can still sell logos for pretty good profit, too.
Technically you could probably do that with Eureka as well. When it was current, I did each area in just a few 3-hour sessions. If we split 9 hours up into 30 minutes a day, it would take 18 days, which is close enough. Let's include Variant dungeons, which have multiple routes and we will have 3 of, in place of the other 3 areas. There just isn't the social interaction involved.You can leisurely get max rank while playing 20-30 minutes per day for 2 weeks
Of course, bosses and some area design are put into 3 V&C, Ocean Fishing, or the MSQ changes (although a small portion of that could come from the HM dungeons we got in Stormblood).