The rules should apply the same to monsters and PCs except for specific rules to the contrary for a specific purpose such as minions. Differences should be the exception, not the rule.
But this is 4th Edition, so they don't. It is spelled out in the rules of the system. Monsters do things differently.
Should unfortunately doesn't figure into it. The system is designed to function a certain way, and so it does, with take it or leave it being the only real choices in that regard.