People really don’t understand the BSC well and just throw out numbers. You aren’t just looking at a picture. You are feeling fat deposits, checking specific parts of the body, musculature, and condition to get to that assessment. It’s not advisable to do via a photo. You need hands over the ribs, around the dock, croup, you need to stand next to them and look at their neck, shoulder, and withers.
I disagree that most race horses are a 3. Absolutely not. Most are within 4-6 depending on level of fitness and connections. The Public sees a waspish waist and thin outline and immediately assume skinny — without noticing the thick layer of fat over the ribs and spine, the divet down the back, the fat along the croup, and the lack of definition in neck and shoulder and withers. Justify is a good household name example of a horse that is absolutely not a 3-4 BCS.
Maybe in the thriftier tracks you see declining condition but the top level athletes are absolutely not a 3-4.
I don’t think I said anywhere the horse would keel over and die, so I find that phrasing a bit hyperbolic…
A genuine BSC of a 3 in a non-performance horse is typically from a chronic situation barring significant health event like hospitalization or illness. Horses don’t go from a 6 to a 3 overnight. There are a lot of factors at play but long term malnutrition and poor body condition do not only come with loss of fat. I wish more people understood that.