The main concerns surrounding Diablo 4 from doris89592's blog

In comparison, Diablo 3's campaign took between 15 and 20 hours to complete. This pegs Activision Blizzard's new hack-and-slash as Diablo IV Gold potentially having a larger, more substantial experience on launch day. The open-world feature is arguably most important for the end game experience in Diablo 4.

That's without taking into account Diablo 4's endgame and co-op multiplayer, as well as other assorted activities, which are presumably going to be designed to keep players enjoying the game for a good long while, even after they wrap up the campaign itself.

The main concerns surrounding Diablo 4 aren't necessarily those that relate to gameplay and longevity, however. Following the launch of Diablo Immortal and its excessively aggressive microtransactions, some have come to believe that Diablo 4 could be similar to Immortal in this regard. 

The fact that Activision Blizzard all but confirmed that the game would be a live service title didn't help these suspicions, either. Whatever the case may be, players interested in assisting with Diablo 4's development may consider signing up for the Diablo 4 beta. 

The beta does not have a launch window at this time, but it's worth remembering that Diablo 4 is supposed to come out sometime within the next 12 months, according to Diablo 4 Gold for sale what was said at the Xbox and Bethesda Games Showcase 2022.