While older blocks are removed, the integrity and security of the blockchain remain intact. The summarization process ensures that all critical transaction data is still accessible and verifiable, and older data is still available in a summarized form for auditing or reference purposes.
This would need the existence of
let's call them super nodes that keep those older blocks which means the end of decentralization as all other nodes will depend on
a few super nodes at the time when they consume relevant old data.
Storage technique is progressing with time thus it is better to count the chickens after they are hatched.