2., 3., 4. Voting with your wallet once again.
5. That would be illegal in many jurisdictions, some countries even have a centralized systems for doctors to upload documentation (that you access using your ID as an authentication token).
6., 7. Unless the employer provides said smartphone, that would be illegal to require in most countries.
8. Vote with your wallet, also all such airlines can print a boarding pass for free if you do the checkin on the website.