You know the Forum is an exchange of ideas which are eyes openers. I don’t know who the Forum Member was, but he commented, “the way you keep the arms straight on the Back and Forward Swing is keep the arms close to the torso or armpits.” I have even seen videos that demonstrated how to stretch the arms like in a Yoga Class. It worked for me because I was concentrating on the arms only. It is like saying, “The horse before the carriage.” “The chicken before the Egg.” It is that simple. Epiphany.
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Nicely said, @Patrick Anlauf!!
While I consider "straight arms" to be pretty much a non-negotiable (barring any physical limitations that preclude this), as is the case with various components of this swing you have some leeway with regard to arm/torso connections. The Tees in Armpits Drill excerpt from the book below provides a baseline for sufficient connectivity. You don't want to go any less than that to where either or both of the tees fall out. You can connect a little more than that, but as @GolfLivesMatter says you don't want to overdo it either.
Thanks for your very helpful post!!