I'm instructions from a kit to make a batch of pomegranate wine. The
kit was successful so I thought the process steps would work with the
fruit wine. I'm not an expert by any means, but I do have grasp of the
fundamentals.

I started with an SG of 1.07 and today it is down to 1.048.
Fermentation is slow, but steady.

Here's my question--the instructions say to rack the wine at or below,
but not above, 1.020. Can anyone tell me what is magic about 1.020?
I'm not challenging the instruction, I'm just trying to understand a
fine point.