Rooting Or Unlocking Bootloader Might Void Your Warranty, which is there in the Nothing Warranty Policy, Here is the link Warranty Policy – Nothing India.
But It is not necessary to Root your device, Because the Nothing is great for everyone, if you want to explore Android by Rooting and by Installing a Custom ROM, just buy a new budget phone or experiment in your Old Device.
If you definitely want to Root your device, Just Wait Until Your Device Warranty is ended.