Come on people, open your minds up a bit!!
We each carried in excess of 20kg (thats about 44lbs, one third of body weight) and had no problems what so ever and had a really enjoyable 6 weeks. Not all of believe in Catholic pain and suffering!! It is notable that all the miserable people we met on the Camino were the ones that didn't have their little comforts, or were freezing cold because to minimise wgt they left that big heavy coat at home, or they had loads of blisters because they had only one pair of walking shoes. Not to mention the people begging for food or medical supplies, etc. I could go on.
We had everything we wanted and almost everything we needed.
This obsession with carrying only 10% of body wgt is verging on the ridiculous and whatever "expert" came up with that figure was probably referring to some very unfit people who have never walked a signicant distance in their lives.
Its all about knowing your body and your mind. Be in tune with both of these and ignore what's happening with other pilgrims. A few years ago I used to get severe knee problems when hiking. So bad that I couldn't physically walk at times it was so excruciating. After a bit of research, I learned to do some very basic exercises before long walks. Haven't had a problem since then. I had expected a flare up on the Camino, but to my surprise I had no problems at all. My left ankle had occasional swelling which was resolved by changing footwear. Luckily, I had a change!!
Its not the wgt, its how you carry it.
So to conclude,
Stop trying to package everyone as being the same. There is no right way and there is no wrong way. We all have our own journey.