I believe this has to do with ‘stretching’. When people practice they say that they developed nice stretch though in reality it’s more about learning tricks how to fret notes that are far from each other.
For example, my pure lateral stretch is small.
But my frontal stretch is larger (I believe it’s true for most people )) )
So I could combine that two positions and instead of doing pure lateral stretch
I do combined stretch (lateral+frontal)
The trick here is that to achieve that combined position my hand must have some angle to a neck. And while it’s not a problem near the headstock it’s difficult near the guitar body (usually because of elbow).
It may be just me, or it could be true for any guitar player - I don’t know.