> Another usecase that already works better without any cryptocurrency or blockchain involved.

Agreed! But if I've learned anything in my years on earth so far, is that anything that can be misused, will be misused, and if companies and government can do something that adds more abilities for tracking people, they'll go that way. If it can work cross-border, give people the impression it's "the future" and let companies/governments get more power, then they'll continuously push for that future.