This is the problem that the standard MMO approach to content slowly causes to fester, and which tends to kill games over time. Even if they streamline it and make things easier, they can only do so by making it more boring, in most cases.

In the case of ARR, removing some of the boring errand quests may help, but it could also damage the story a bit.

Usually, MMOs take the same approaches FFXIV is: skip potions, buffed XP at lower levels, and content made easier. There are problems with those solutions, though. Skip potions are of no use for people who want to do the story, buffing XP is largely useless because players cannot access content until they do the relevant story, and making content easier for new players gives a bad impression ot the game.

As a new player in an MMO, here is how I usually feel:

I want to play through the story, even if it's not great. I want to feel challenged so that I can actually learn the game. And I want to be able to have fun with all the great content I pass by on thr way to end game.

As it stands, though the playerbase is the largest obstacle to that. Players are the ones that encourage developers to throw away old content and constantly shower them with shiny new things. Players are the ones that outright abandon perfectly good content, thereby encouraging the developers to throw it away. And this constantly moves the point at which new players can participate later and later, creating an ever-larger gap for them to cross.

If new players were able to enjoy end-game style content with an active playerbase, by Lv. 50, they would be able to have fun while doing the MSQ at their own pace.