You overestimate the data gathering capabilities of the medical system by a huge margin.
Even in seemingly objective parameters, you will see: missing data, reporting details dependent on the gatherer, a substantial amount of inaccuracy, etc. etc.
Plus, you are describing people who barely know how to use a web browser. And you should also take into account that people driving the system don't even see the value of expert, scientific educated consultancy in those matters. For example, I was just asked to perform "data mining" on a dataset of 150 observations, 400 variables, and ~20% missing data by a renown professor. He told me I was bound to find interesting things in view of his ~400 back-to-back t-tests.
No, I am quite confident in that ML will really take off when data fed to those systems will be automatically gathered.
No, I am quite confident in that ML will really take off when data fed to those systems will be automatically gathered.