Cant really see any issue with you leaving auto update on, it will just periodically search for an update and install it for you without you having to manually search for it.
Its a personal preference you can choose.
There's no danger as long as you also regularly back up too.
Personally I like to see first what the update is bringing and check to see if anyone is experiencing any bugs.
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.