> 1. Most data attributes cannot have individual docstrings, so I expect the class docstring to list and possibly explain the data attributes. 

But almost all PyStructSequence field have individual docstrings.

> This does not create a second new class and is not a 'trick'.

Thanks for the tip.

> I presume that is why property docstrings are not used much.

Indeed, only 84 of 336 Python implemented properties have docstrings .
However this is even larger percent than for methods (about 8K of 43K).
And 100 of 115 PyStructSequence field have docstrings.

I think Python should have more docstrings, not less.