Thanks for the link.
I've turned into a fanatic about thread; here's what I've come to
For hand piecing: either Mettler cotton embroidery 60wt or Bottom Line a 60 wt poly.
Applique: Bottom Line usually, sometimes a silk thread.
Machine piecing: Aurifil in the needle, Bottom Line in the bobbin
Hand quilting, which I seldom do, I often use Bottom Line, or one of Superior Threads cottons (not Masterpiece) or veriegateds if I want the thread to show.
Machine quilting: I pretty much use what I use for machine piecing.
I don't find any problem using a good quality poly thread with cotton fabric.