describedby pointing to display:none element (action 1104)

https://www.w3.org/WAI/PF/Group/track/actions/1104

I'm looking into this action item relating to mapping aria-describedby pointing to an element that has style=display:none.  In UIA Express, IA2, and ATK/AT-SPI, the te

xt of the referenced node is copied to the accessible description property.  In AXAPI, it is copied to the AXHelp property.

UIA does not have a description property.  I'm trying to decide how to solve this problem, and getting some pushback on the idea of adding one.  Back in the MSAA days, we found that some apps were putting odd things in accDescription, and that a lot of AT didn't use it.  That was, of course, a long time ago.  I notice IA2 and ATK/AT-SPI have description properties.  Are they currently misused or full of junk?  Do AT products make use of this text?

We could also use helptext like Apple does.  James, does this work well for you?  Do you run into collisions with other types of help text?

Here's the relevant bit of the CAAM http://w3c.github.io/aria/core-aam/core-aam.html#details-id-76

Thanks,
Cynthia