Derek parfit view on personal identity

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Derek Parfit's view on personal identity emphasizes that identity is not a fixed essence but rather a dynamic process. He argues that our identity is constantly changing due to the continuous regeneration of cells and the exchange of atoms, leading to the conclusion that personal identity is not as stable as it seems. This perspective can be understood in two ways: the objective reality of identity, which acknowledges the physical changes over time, and the subjective experience of identity, which is shaped by personal perception and memory. Critics of Parfit's view point out potential flaws, such as the challenge of reconciling the fluidity of identity with the need for a consistent self-concept, raising questions about the implications for moral responsibility and personal continuity.
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I am trying to understand Derek Parfit view on persistence of personal identity. You don’t have to take in weird examples such as branching. Can you also show some of the flaws of his view. Can you advice?
 
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There are two ways to view identity:

As it is. Our "identity" is constantly changing. Our cells constantly die and regrow. Atoms constantly move in and out of us. But we still appear the same.

As we regard it. That's purely subjective.
 

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