Hypothetically, if generally adopted as a standard: it would enable any site to decide that it only works on a specific (cryptographically-signed) hardware / so

Hypothetically, if generally adopted as a standard: it would enable any site to decide that it only works on a specific (cryptographically-signed) hardware / software configuration. So "Your bank will require you to login with Edge on Windows 11, or with their smartphone app." The social concern enabled by the tech concern is that we might see, say, Google go "GMail can only be accessed by a browser running Chrome," and they lock-in their market dominance not on quality of the application but on network-effect necessity of installing it to access your data.