We tend to become blended with the identities and perspectives of [[Parts]] with [[Burdens]] when they get triggered. Blending happens in degrees. When we're very blended with a part, we may seem to have no access to [[Self]] and lack awareness that we're blended with a part at all. When we're not very blended, we can be aware of the part, know that the part is not us, and have some partial access to [[Self]]. Full access to Self (or close to it) is called [[Self-essence]].
[[IFS]] helps us to access [[Self]] by [[Unburdening parts]], which makes them far less prone to being triggered, contracting, and identifying. [[Nonduality]] goes directly to [[Self]]: [[You can go directly to Self]]. Both have merits: [[Healing aids awakening, and awakening aids healing]].
(Ultimately [[Parts]] are [[Self]] too ([[It's all awareness]]), but that doesn't do us all that much good if we still feel like we're blended with a part.)