But why does it need to be decentralized, why does it need a coin, and why does it need a blockchain? Why is it not already considered extremely overvalued if there's a max supply of 8 trillion?

What unique problems does it solve with any of this new technology? Why are centralization and industry standards in healthcare something that needs to be circumvented with a decentralized application? It seems to me like the study and practice of health and medicine would benefit from more centralization, not less.