About burying of roots, there are years I buried the stems deeply without benting, there were years I did the benting. General feeling it worked slightly better like you said if the stem is bent to L shape to root.
Another point even more important is the health of the young plants. If left too long in a small pot and the stem starts to be stiff and thin, then L shape stem planting won’t change much, like @shrinkrap mentioned in the other thread, pot up is important for tomatoes, for more sturdy plants.
