Yup, I could not agree more. I would not re-use soil at all. If so, it would really need to sit out and breakdown a bit before re-use. We do it her on the farm for citrus, palms, and other plants, but we allow the recycled to sit out, we water it a bit then allow it to dry out and breakdown a bit. We add more stuff to it to re-enhance it and allow it to become enriched again, but never just re-use. There will more than likely will be old roots that are breaking down and rotting still left in the soi, that's no bueno for plants from my exp., bro..