Royal Marines conduct combined arms exercises to refine the skills of taking and controlling urban territory from an enemy force, whether uniformed or insurgent. Being able to take and hold critical terrain is the essential element of maneuver warfare.
It’s not just about pulling up a rifle and hitting a target at X distance, that is just a foundational skill and one of many. Moving efficiently to force control over an objective is even more important than the shooters being able to hit their targets. If I have 10 commando types take a building from 2-4 bad guys it doesn’t much matter if those 2-4 end up dead, captured, or just ran when they knew they couldn’t hold.
War is far more than just dealing casualties to the enemy. Taking the territory that offer them the control they were exercising, that will complete objectives.