I want to point out that the content we get is underutilised. We would not really need more content if the things we get would be used better. Normal Trials, normal 8-man raid, variant dungeons, the utterly disappointment the relic quest was this expansion, Dungeons which have nothing to offer and are braindead easy on arrival and Fates which nobody likes anyway.
Also two main problems I see is that the tomestone gear is too powerfull and too easy to get. It makes other content rewards redundant.
The other problem is the idea that everything (except savage and ultimate) should be playable with second and third jobs. Which means the new content in a patch is balanced for the gear from basically two patches ago, since we can get that gear without any weekly lockouts now.
And that leaves a gap in the content. We have mechanically difficult content which requires good gear and we have mechanically easy content which does not require good gear. But no mechanically easy content where you actually need good gear for.
And also no reason why we even should play such a content, because 5 times expert roulette in a week and your tomestones are capped.
So what do we even want from new endgame content? Just a mount like criterion offered? New gear which nobody needs like we got with Bozja back in ShB?
This game needs a completely new structure for the gear treadmill to make new endgame content worthwile. Everything is catered towards savage raiding. And if you are late to the party there comes the catch-up patch so you can enter the savage raids faster. But the majority of the playerbase is not interested in doing savage, so what does their endgame even look like?
I share your opinion that we need more midcore content. But - midcore content is difficult to add. Either you have content where you don't have to talk to your group because it is easy enough, or you have to talk to them in order to agree on the strategy to use.
But people have anxiety and don't want to talk to randoms.
Such content has to be designed for only 4 people because that's easier to fill with people you are comfortable to talk to.
Too bad they dropped the ball on criterion and made it savage level, not midcore.
8-man "midcore" content would likely be dead on arrival. Too much anxiety to enter as a casual player, too easy and no worthwile rewards for a savage raider.