My view of my own forms is that students can adjust small amounts to make the basic movement anything they can give a reasonable explanation for. If I put in an elbow, and they replace it with an uppercut, I'm okay with it if they can explain their choice and can make it work with the basic pattern. I feel like that's how forms should work. I've heard the black belts discussing similar adjustments (though with apparently less leeway) in the Shorin-ryu forms during yudansha classes.Hidden applications is a silly concept for what you are trying to achieve through forms.
Forms are going to increase your basic range of movement. So you wind up being able to squat lower or reach further jump higher.
That way when you do application your body is in a position to do the technique you want it to.
They are not hidden. Basic core movements have multiple applications.
And understanding that stops you getting sucked in to this rabbit hole that is bunkai.