Agreed.
Financially speaking the market is fine, from a gamers point of view ARPGs like Diablo are limited in variety though. It’s either F2P/P2W games, PoE, D4, LE, Torchlight, and older variations. There’s more in the works of course, but currently options are limited.
What I’m talking about is content in general. Which includes but is not limited to: End-Game, Progression Systems, Crafting, Itemization, Class Balancing (which includes tweaking of combat), QoL Features, Reward Systems, Stash Space, Character Slots, Consumables, etc.
What we have now is a more complicated D2, trying to be a D3. D2, objectively speaking, has very little content. Back in the day it was great, but today it’s outdated. D3, while having more content then its predecessor, is all about grinding GRifts with little variety involved and an endless progression system that just turns your character into a hilarious god who spits out literal quintillions of damage.
D4 currently is lacking in all areas by today’s standards. NMD are the equivalent of Grifts, but you use them to level up, instead of them being only available at max level. While there is some difficulty completing tier 100, it pales in comparison to the Grift grind. NMD are also very static, where as Grifts were randomly generated, adding a little flavor.
So as I said it’s not just one system that needs more content, it’s quite literally all of them. More end game content is great, but you need a progression system, a progression system is great, but you need QoL features to compliment it, QoL features are great, but you need itemization to help it along, itemization is great, but you need class balancing. It all works in tandem, and one system becomes shallow if the others don’t keep up.