before u even think of relocking bootloader or unchecking oem unlock under developer options, flash stock recovery 1st, then u can try to unlock ur bootloader, again oneplus supports unlocked bootloaders, so if u are worried about warranty, its still under warranty with bootloader unlocked
I know security can be annoying, but come on, it does not make your device useless. It's not like if you would see it very often though.
It's good that they make people aware about the risks and implications of unlocking/rooting your device.
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