Was thinking about this one recently while leveling another class.

One of the main features of FF14 is that you can level up every class on a single character. However this means once you've run through the MSQ for the first time, very often it means you never experience it again. For some people that's fine and they'd rather not have to slog through Titans Dinner and the Garuda chain again, but for those who'd like to experience it, it could be nice to have the option.

Perhaps something like the following:

When you start an alt class you can choose an option to reactivate MSQ. This would...

-Set you to lv1, even if you're a Samurai/Dark Knight
-Trigger the opening MSQ cutscene with Brendt/Brennan.
-Reset MSQ progress for that class only.
-That class would get the alt armory bonus for MSQ quests.

In addition to letting you see the MSQ from the start again without needing a completely fresh character, it would be an alternative leveling path to roulette spam, fates and beast tribes.
The idea could definitely be tweaked a bit but just throwing it out there.