[arch-general] efivars mounted read-write, but "operation not permitted, "

Hi All, This is admittedly more about Linux in general than Arch specifically, but I’m wondering if anybody has insight into why I can’t delete EFI variables, when efivarfs is mounted read-write. For anybody interested, I am wanting to remove the default boot entry created by systemd-boot, but receive an “Operation not permitted,” message when trying to do so, even as root. Any insight would be appreciated. Thanks much, Zack.