Right. Personally I've observed my squat form and ROM are much better if I stretch my hamstrings first. So I stretch first to get more benefit from the exercise.

I bet it changes based on a few factors including age, prior mobility, etc. I do a few things at my current age:

  I wear Vibram "toe-shoes" so that my heel isn't lifted off the ground when I squat or do other movements and unless I'm lifting very heavy I go below parallel
  I warm up by doing either some prescribed warm-ups or by getting on the air bike/rowing for a few minutes + other warm-up activities
  I do the exact exercise movement I'm going to be doing if it's a movement like a snatch, clean and jerk, deadlift, squat, etc. to warm-up 

I don't do any stretching before or after. It's absolutely fascinating that so many different things work for so many people.

yeah your hamstrings might not be so tight, you may have different ratios in your leg bones, who knows! lots of anatomical variation

> If you're getting full range of motion exercise, you don't need to stretch, because the exercise itself is doing what needs to be done.

I dropped powerlifting when gyms closed in 2020. I picked it back up recently. With a garage gym it's now so easy to lift without so much dang ceremony, just warm up through the exercises themselves. Sessions all under an hour, PRed all three lifts at my meet, and never got a red light on squats when I used to get one for depth on one side all the time. Stretching is all time fake in my book.