when was this an issue? all i do is sit on a hhkb and macOS all day. i never had any issues?
When the Hybrid first came out, whatever MacOS was out at the time and also the one after that too. They have it as an FAQ entry on their site:
https://hhkeyboard.us/support/faq"Why am I not able to log in to macOS while using Bluetooth?
This can happen when FileVault is ON in the Security & Privacy settings under System Preferences of the Apple menu. In this case, log in with your Mac keyboard or connect the HHKB using the USB connection. Please note, you will need to restart and log in to your computer before being able to use HHKB in Bluetooth mode."