Please consider significantly bosting the side quest exp rewards, perhaps particularly when you get a job to 90 or through some sort of armory exp bonus mechanic.
I saved the quests for a second job because I thought it would be a fun way to level, so once I hit level 90 on Paladin, before finishing the MSQ I note, I decided to level SMN to catch up to the MSQ that I have left that still gives exp (88).
Ran back to areas with huge amounts of quests excited to fly in levels and get some story. I suppose some item rewards are nice in a few quests but largely it was not a useful option. I didn't need the quest exp when going through the first time (again noting just by occasionally doing some FATEs I had hit level 90 before even finishing the MSQ), and apparently you don't really need them through the second time either. Since 1 quest gives you about 1/2 or less of a single FATE but can easily take longer to do.
Now there is item rewards sometimes, and the lore can be fun, but technically FATEs also have item rewards... Quickly became do the quests to clear them off the map and maybe learn something fun, but not because it was a rewarding method of leveling as a better choice would have been to do FATEs (Bozja, dungeons, basically anything else- even though quests are a one time deal, which to me means they should be stronger then).
So I sincerely think boosting the side quests would be a good thing. And if there is a worry about launching a first time player way too quickly to cap, which is valid, then perhaps consider bonus exp when you hit cap or better yet when you are benefiting from the armory exp bonus. Particularly I think some sort of armory bonus would be a really smooth solution. As for the amount I don't really like to think too long on numbers since balance is a fine art, but at least it should be comparable to a FATE... though I would want to say more than that.
Another suggestion then is perhaps open some of these quests later via some means that keeps them from inundating new players in the area causing them to get more exp then they need or feel annoyed that they did the quest when it was worth less (before their armory bonus kicked in).
Thank you for reading
Not a serious issue, but was / is a bit of a minor annoyance (doing the quests to clear the map and maybe learn something, when at least I feel my brain is trained to do the quests because it's a valid source of exp).