But then the parser would be willfully obtuse and most of the gameplay would be figuring out the exact combination of commands to unlock the next snippit of the story. Sometimes requiring the player to telepathically connect with the developer to figure out precisely what phrasing he intended.
You see a special looking rock on the ground.
> PICK UP THE ROCK
Huh?
> PICK UP ROCK
Huh?
> PICK UP SPECIAL ROCK
Huh?
> PICK UP THE SPECIAL ROCK
You pick up the rock, it feels special in your hands, you are certain it will be important sometime later.
> PUT ROCK IN POCKET
Huh?
> PUT SPECIAL ROCK IN POCKET
Huh?
> PUT SPECIAL ROCK IN MY POCKET
I can't do that.
> OPEN POCKET
Huh?
> OPEN MY POCKET
You open your pocket.
> PUT SPECIAL ROCK IN MY POCKET
You safely store the rock.
It is no mystery why graphical adventure games basically wiped out the text adventure games.