I think game designer take platform constrains into account of what is feasible. So avoid situations that are not feasible and don't fit into the game.
So a massive online D-day WW2 landing event with 10.000 vs 10.000 not feasible.
A fire fight middle in a 50.000 concert of popband is not feasible.
The predator movie event cutting down jungle with a gatling gun in photorealistic why with high fidelity of jungle leave physics interaction in fine grain detail. not feasible.
So it is not laziness it is often just not feasible.