To answer the original post; we shoot light draw weight bows in the UK because we don't hunt,don't often use compound bows and heavier weight bows are simply not an advantage when learning to target shoot.
First part is spot on ,, bow hunting in the UK is prohibited by law.
Second part,,, not so much !.. There are
a lot of compound archers in the UK & growing. Myself included ,,, I shoot an Oneida Kestrel and a Mybo Origin.
I shoot trad recurve too and target recurve as well.
The draw weight comment is spot on ,, start small ,, work up to what you are comfortable with.
You dont need a 70lb draw bow to hit the gold on a target,,,, you need practice.
Give me a 24lb recurve and an 30 mins to get acquainted and ill put two of 6 in the gold at 40 yards.
I see so many new people who have gone out and bought there first bow without any advice and there horribly over bowed.
This is an injury in the making.
A Topic for another forum
On the discussion of the penetration of a Long bow arrow ,,, on Youtube there is a video of a bag of sand with boards secured in it and an soldier shooting with three different calibre of small arms,,,the highest calibre made it to the last board in the sand.
The arrow went further because of its penetration value. Bullets crumple on impact ( severity depending on what its hitting ) Arrows not so much .
Found the link
https://www.youtube.com/watch?v=eOM4IQjQtM4