It is a learning experience for each quilter. Sometimes we don't know what we don't know.
I've used Aurifil and So Fine for piecing as I learned about them in class from our instructor. A recent experience with Glide for quilting that was good too. I had previously used the pre-wound bobbins but not the cone threads. I also use pre-wound bobbins for piecing at times.
I've used EMB polyester thread for quilting without issues. It's even been used for piecing on occasion. I've never melted it with the iron so far. LOL!
Threads (and needles) can be a confusing lot in the life of a new quilter. Eventually, we find our own way.