Deleting your efi partition doesn't brick your board. It just makes your disk unbootable, but you can always install another operating system and create a new efi partition.

I think you're confusing with the special efivarfs file system that is mounted under /sys/firmware/efi/efivars. If you delete stuff under there, you're apparently going to have a bad time, because it directly deletes variables in your UEFI firmware which can prevent your system to POST.