Because Diadem#3 and Diadem#4 were content ?

They could just have made it to "farm fate on the highest level zone" and it would have been the same instead of creating 2 content island on the basis of already *removed twice* fate farming zone because people didn't like it.

The slight relevance of those 2 zone are the isolated leveling that make it a slog at release thus not insta dead and crappy RNG gated drops of minions/mounts/whatev.

The new relic is the consequences of player actions.
Players had always complain that they were "forced" to replay older content for relics. Look at D#4 that makes you replay alliances raids over and over.
This time, they just said "pick your poison".

And I will have to disagree that EW is lacking. They try new type of content to see if it is appreciated or not. Criterion and variant DG, they revamped completly PVP to be more accessible, and even IS is testing grounds. It can even be seen as a test for a way to implement instanced housing.

I have played this game for almost 10 years and I can say that even if some patches are lighter and some periods of time that have "less", this situation is not exeptional.

Hell, I would even say that 8 and 24 men raids are far more original that we had in the past.
SB raids for example were low level fan service with boss from older titles that pop out of nowhere or FF XII """""tribute""""" (the worst ivalice game).
Here, at least we have something better that : "beep boop does not compute *throw kefka at you* and Ivalice 75% off.

And there is a solution you know: If you dislike the content or the game, don't play it. If enough people are don't play the content, it will show in their numbers and will adjust it in the future.
As long as you keep paying and playing something you seems to hate A LOT, no amount of forum posts will make them understand that you don't like it and if numbers are not droping, they won't change what you may not like.

Diadem and feast died like that so...