It wasn’t the case for Imageworks, which I finally added aarch64 a month ago. On the other hand, I believe I compiled arm 32 bit with a 3.4 target and the aarch64 with a 4.2 target.
That is not a sustainable strategy 
EDIT: and thanks for updating your apps!
EDIT2: Since this is a burning issue, I’m going to bring it up at the next community meeting.