Love TEAM USA Gymnastics, But Not The Rules

I'm not an Olympic judge, nor would I want to be, but here's my observation on judging these amazing athletes in gymnastics.  Why do they have to include "the landing" or "dismount" as part of the athletes scores?   I feel they should be judged solely on their routine before the dismount, not after and including the dismount.  Just a thought. What do you think?