MWEB...Prunability of spent outputs

Newbie
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Trying to understand how MWEB works …im stuck to what is the prunability of spent outputs and why it makes the blockchain scalable?
Can someone enlight me?

Thanks

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In MWEB, spent outputs can be pruned - as they are unnecessary for validation. Unlike with the regular Litecoin Blockchain, the only thing you have need is the commitment (where input = output + fees). All historical mweb data otherwise can be pruned, this makes the storage of MWEB data much, much smaller.

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Why do you store the data in the 1st place, the blockchain holds information in regards to transfers.