Main Scenario Restriction Bloodstorm - Very Very Bad idea.

[Neophyte]

When you're a new player, everything is relevant content. Again...
When you're doing content for the first time, it is always relevant.

It's not as if the MSQ would ask you to grind this content over and over everyday, that would be stupid and boring...which is exactly what "doing your roulettes at max level every day to gain tomestones" is !

And still 75% of all content with story is actually optional in regards reaching new expansion area.
Optional content with actual story in this game:
All side quests, PotD, ex primals (yes, they have interesting story, too), other trials (Odin, Hildibrand, Triad), half of all dungeons, fates, beast tribe quests, relic, even class/job quests, most GC related stuff and PvP, normal/savage/24-man raids (Coil+CT+Alex+Mhach story), levequests and guildheists, goldsaucer ('mandatory' story content in FF7, why not here? They could have made it so, that you have to visit Goldsaucer in HW MSQ to get a toy for some moogles. Missed opportunity?),....

Why are all those things allowed to be optional, but MSQ isn't? Are their story less worth it? Are they less important to learn the game? Are they in any way less important?

Usually in FF games it's 75% mandatory and only max. 25% optional story content.
Why did they do it the other way round here, when 'this is a FF game' comes first, 'this game is for people who love stories' comes second, while 'this is a MMORPG' isn't even considered by some of you.
There sure was never a FF game which demands me to lvl up my characters just to be able to talk to a specific NPC.. I have to be lvl 36 to do this fetch quest without a single fight involved? In a story-driven game? Why?

Why are MSQ stories gated behind lvl and ilvl (there are gaps 3-4 lvls between some MSQ)? Dungeons could have a story version to be able to solo them with lower than intended level. Would that be good? In terms of story quality: Yes, especially because the MSQ treats you as a lone wolf anyway.

When everything is new and fresh, why do you bother where someone starts? Why do you expect them to spam dungeon grind anytime soon, when there are so many different things to work on starting at 50 in HW area with ilvl 100-115 NQ.
ARR MSQ would still be at least a very long quest which could be helpful to lvl up one or two classes (but with armory bonus and actualy new released jobs) and therefore likely done by most of he players.. just not necessarily at first. It's importance only shrinks to the importance of every other same worth story content (i.e. all content).

Kurogaea nailed it: Be open-minded, not narrow-minded.