Regarding the attributes “ispurchaseable” and “_isPurchaseable” in the item model….is this value set specifically on backorder behavior? Just wondering if there is something else affecting it

I've always assumed that ispurchasable = isinstock || isbackorderable. But there might be dropship/special order cases that i'm missing that i never had to develop against.

thanks - that is what I am assuming too

IIRC, there is some trickery involving matrix items in this concept.