6D - 7D Mysteries

[anagogy]

I'm all for metaphysical speculation, but I guess I'm not seeing much "logic" to justify the reasoning behind it, which makes it hard for me to understand.  So it isn't a matter of whether one sounds more "odd" than another, rather, I feel like the speculation being offered is adding more densities but with no real "why" to it.  

That's my issue: complexity without any legitimate seeming reason.  But perhaps that is due to the way I "conceptualize" densities.  I simply see densities, or rays, as "different types" of experiences in infinity.  So adding more densities from that frame of reference is like taking a pie, which was cut into 7 pieces, and just arbitrarily cutting it up into more pieces.  Sure, you can do it.  But why?

You could argue that 7 was an arbitrary amount of pieces to cut it up into, originally, but I feel Ra explained the function of those 7 slices quite well, so I have little issue with them.  Also, they line up nicely with the colors of the electromagnetic spectrum/rainbow, so I guess I like that.

So more densities is fine, but what is the function of those additional densities? What purpose do they serve?