Building an over-powered AC and sticking with it can break the game a little, but some self-imposed experimentation can keep the gameplay rewarding through the end.

Though there's also a fun power fantasy to be found in blasting through bosses with an immaculate build -- I highly recommend trying a lightweight quad-shotgun setup.

Also: do not be fooled the first time you see the credits roll!! you have not finished AC6 until you have played it thrice!!