Yes, but we cannot keep making the game "Realistic" for if we do, it's going to be boring. It is both a shooter and a platform, if its just a shooter, then why bother even moving? We can use both these elements together to making a Platforming shooter the world has never seen before.
Besides, I've seen labs with latters, metal ledges and all that business.
The point is, this "realistic" thing is going to kill the game. I know I don't want to play a game were the enemy is going to be right in front of you 80% of the time. If you are fighting a guard on the same level as you, just shoot straight.