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Shooters work best when there's plenty of cover or when projectiles move slow enough to dodge. Open world melee games often have wide open spaces with little cover, but shooters can't work in those environments. Open world shooters need dense urban settings, areas with plenty of trees and shrubbery, or only have fights take place in those locations. When there's too much wide open space, it becomes a game of waiting for enemies to peak and hiding to prevent getting shot. That's not as interesting as fighting in close quarters where you can move around more and can choose when to engage enemies instead of waiting for the NPCs to peak.

Unfortunately, dense environments are also more demanding on computers, especially in open world games where you can go almost anywhere. In a linear games, areas can be blocked off and never need to be modeled, but open world games need to simulate a large area around the player, requiring even more resources. Heaven forbid the game needs to simulate the interior of a building 4 blocks away holding an NPC that needs to be able interact with the player at a moments notice. It's why most open world games have loading screens when entering interiors or mostly inaccessible buildings.

Melee based games don't need dense environments to have interesting combat, but shooters do, with denser and more dynamic being better. Open world shooters with dense environments need more beefy hardware to run, so they haven't been possible until recently.