What content has gated you, and for how long?
No content. The only content left are maps/crafting which is completely optional.
Why are you stuck here?
Refer to above.
Are you upset about this? (if so - why? and how can content be added for more hardcore players such as myself without upsetting you.)
Yes and No. I do like that i can take the whole week off after beating everything. Can sell Ex primals for a lot of money too.
Should any changes be made to the content to accomodate you and players like yourself?
Yes, the game as it is is currently too easy, but it will become harder I am sure in the future with more content.
What kind of content would you like to see added in future patches for you to enjoy?
Needs better weapons that are worth striving for. All the gear is boring. Needs FFXI relics which only 1% of the playerbase can get that are worth showing off.