What significance does the user/host at the end of an SSH public key file hold?

This field is a comment, and can be changed or ignored at will. It is set to user@host by default by ssh-keygen.

The OpenSSH sshd(8) man page describes the format of a public key thus:

Public keys consist of the following space-separated fields: options, keytype, base64-encoded key, comment. . . . The comment field is not used for anything (but may be convenient for the user to identify the key).

The ssh-keygen(1) man page says:

The key comment may be useful to help identify the key. The comment is initialized to “user@host” when the key is created, but can be changed using the -c option.

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