As someone sais below "ML is not going to replace raw input from sensors."
> Medical doctors are rarely up to date on the latest technology. I wouldn't be surprised if my doctor has never heard the term machine learning before in his life.
Current dignose equipament is big, invasive and unconfortable; often they require you to stay one night at the hospital.
There are tests programs about using those devices to replace current tech (obvious reasons: less costs, less invasive tests, subject owns the hardware…)
This kind of procedures are not used because "doctors are old and non-tech people", it's because it's not working.
Sure, apps and smart devices could replace some day those devices but they need more and accurate sensors. Extrapolation of data from a good-enough pulse rate sensor it's not a replacement.