My first tertiary qualification is in Applied Science. Science is about measuring things. Engineering is based on science. If you don't calibrate your measuring equipment, science becomes irrelevant. Dynos , in particular are often good at measuring improvement, if their repeatability is good. But for comparison of the power of bikes present and past, they are probably not very good. I think that Heenan and Froude test brake that Bob McIntyre used, would have been properly calibrated with a dead-weight tester. However history is probably irrelevant when you are developing a race bike.