TWRP hasn't been needed (never really was) in some time. Fastboot and adb will do everything you need. TWRP never really figured out the dual slot setup of modern android phones.
Do you need root? I would look more at a custom ROM to get to the latest OS. There is at least one Android 14 based rom for the oneplus 8. I run the latest OS on an old Pixel 3XL with no issues. No root as I don't find I need it anymore these days.
If you need root then yes, you are looking at extracting and patching the boot image with Magisk. There are probably pre-patched kernels on XDA already.
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