Based on the data they have available now the big one for me would be looking at cadence trends (@occasionalathlete touched on this briefly), as I imagine TR have one of the biggest cadence versus target/actual power data sets in the world.
When researching optimum cadence a while ago everything I found was really vague (it’s personal to each cyclist etc.). It’d be really interesting to see if any strong cadence trends actually emerge from all the data TR have.
Do people performing well on the ramp test all share a similar cadence range when completing the test? Are there any cadence trends shared by the cyclists with FTP’s above 300W? When completing intervals at 110%/120% etc. does any particular cadence seem to be more effective to successfully hold the target power?
If any decent data comes out of this, the workout instruction text could be improved to be much more specific; so instead of recommending a cadence range of say 85-100 for a particular intensity, it could be much more specific and state that, for example, 90-92 rpm is the most effective cadence for the intensity.