Have fun going through all the available information to us as visual tool. You seemed to enjoy the visual aid more than finding out which tool best fit you personally.
We certainly did not have all of these gadgets even a few decades back.
I understand because my wife is a visual learner. So are many who I personally know.
The “feel” you’re searching for is long been discussed as the one most difficult point for an instructor to relate to the students. Harvey Penick rely on story telling, modifying a golfer’s existing form in the smallest way by not changing it much. Quite a few depending on the “drills” to band aids over the issue, especially with the new generation of teaching pros who rely on technology these days.
Not until the golfer has that “Ah-ha” moment will the golfer fully experience and understand the lessons and the tips and the drills trying to do.
If you are just looking for that moment and how to feel about a proper transition. I can only tell you what I personally feel and not the best solution for everyone. Certainly will have a lot of disagreements.
The use of body weight + the torsion of the core with the release of the smaller, most outer part of the connection ( arms and hands ) completes the golf swing.
So, How do I feel about when will the starting, trigger, point of transition?
Think is winding up a spring or a thick rubber band. Depending on our individual physical ability, we should know when we reached our limit on the winding. And, when do the winding , unwind? it really has more to do with the person’s built in rhythm and timing.
Nick Price has a very fast winding and release, probably the quickest on the Tour in his days ( probably still is ).
Where Sam Snead had that relaxed, lazy feel swing. But all of them start to come back down to the golf ball when they reached the limit of their winding. Only person I saw with a slight pause on the top of the golf swing was Nancy Lopez.
It worked for her and she is comfortable doing it. Can’t dispute the result.
The valuable lesson I learned from my first instructor as how he explained the winding and the unwinding of the golf swing. Think of the the club head is the end of a sling. One winds up the motion by starting with the clubhead, hands/arms, shoulders, upper torso, hip, thighs, then the feet which connects to the ground.
The unwinding, is the reverse sequence in the winding. By the first motion (trigger) of the lower body, unwinding the torsion built up during the back swing in the reversed order and finishing with weight forward and the release of the golf club head through the impact.
In short, again, the “trigger” you’re searching for should be from the ground up. some like to think it’s the knee, some like to think it’s the push of the feet against the ground.
Never starting off with the arms first, that’ll be a recipe for casting.
One very important tip which the same teach told my more than 4 decades ago, is to feel the club head lags behind the hands, playing catch up all the time until accelerating just before the impact.
I did not understand this until my 4th or the 5th year.
Always appreciated his teaching as the lessons with him trump all the other learning avenues I had went through later.