And to be clear; I think the gist of Lucky's reporting on this-- and most certainly the reports I'm hearing-- is that not _all_ EY awards are unbookable right now with AAdv miles, but, rather, looking for a pattern as to the ones that aren't and **IF** that points to some kind of new issue/limitation that we've not seen before.
Definitely still developing and not conclusive yet, but Lucky's blog piece on the subject very worth reading.