Sorry to hear that it wasn't a good experience. But based on the following you provided, I'm not the least bit surprised.
- The guy tells me my stance is too narrow
- he wanted my right shoulder HIGH on the downswing
- He was enamored with getting 20 more yards out of my 7 iron
- he was intent on getting me up to 170
I've had enough lessons over the years to figure a few things out. First and foremost, an initial lesson with a new instructor is basically him/her getting familiar with how you swing the club. That will help them determine if you have any physical constraints, like lack of flexibility, possible prior injuries, etc. And then (most of the time) it's about the basics... PGA - posture, grip, alignment. If the setup is flawed, does it really matter where your right shoulder is on the downswing?!
I don't like painting with a broad brush, but most golfers' problems originate from a deviation from good setup mechanics!
And last but not least!, no instructor worth the ink on his business card would advocate a student swinging in a manner that he feels is beyond his ability to control the direction of his club path. Nor would he give you more than one (maybe two - tops) thing to focus on before the next lesson.
Your takeaway about it being disappointing says it all. That is not the objective. The objective is to make progress, one lesson at a time. Slow and steady. Sounds to me like he tried to force-feed you the entire elephant, which is the hallmark of an instructor who is soon to be spending more time cleaning carts than giving lessons.
Good luck moving forward. Unfortunately, finding the wrong instructor is often times easier than finding the right one.