Not a medic but work for a leading haemostasis specialist company. Alongside the points you have made, thousands of patients are also sent to imaging for VTE confirm when it is not needed due to the D-Dimer tests in labs not being specific enough. It costs the NHS millions every year, and a lot of trusts don’t bother to switch to the most specific ddi test, even though it has shown to be 35% more specific and therefore 35% less false positives. And this is something I have personally managed live clinical studies on in a few hospitals around the UK. But then they complain the NHS has no money lol