I realized this while talking with a friend who started recently but a lot of pretty important quests are kinda archaic to find and I think there should be an in-game way that indicates these quests better.
Specifically quests such as any optional dungeons, raids and trials like Coils of Bahamut or Warring Triads and so on.
I don't think the current "recommendations" system is really good at conveying these ones specifically.
You pretty much have to go out of your way to google it or have your friends direct you to where these are.

I feel like something like how the job quests are shown now would be a nice way to go about it for these.