Transformation is not a thing, it's a context.
From a transformational context, everything is perfect, just the way it is and people have barriers to experiencing the perfection which everything, including themselves, possesses.
It is possible for any person to shift from a traditional right/wrong, good/bad context to a transformational context. They can shift to a transformational context in any moment. Their transformation can also be lost in any moment.
When a person shifts to a transformational context they experience a profoundly different world. The experience themselves and other people very differently. A element common to people's experience of transformation is unconditional love for themselves and other people.
Do people need to become transformed? No, they're fine the way they are. Yes, untransformed people do suffer more and tend to be less effective at getting their needs met.