FaceID works great for me in 2023, so much so I use it with Apple Wallet to pay for stuff at the shops and it has been 100% reliable and unlocks the phone quicker than I can present it to the card reader. Also, it works if your phone is in landscape mode nowadays too. I haven't really used it in the dark, but understand it uses non-video depth sensor or other part of the spectrum to track your noggin so should be be fine.*

*It's dark here in the UK, i just switched off all the lights and unlocked my iPhone with FaceID, perfect, first time, flawless.