If your list is for example a list of nfts you might want to be able to access it using the nonce of the nft.
If you only have a VecMapper you would need to load all the items in the vecmapper and iterate over them to find the nft with the right nonce. This will obviously not be possible/extremely expensive
If your list is for example a list of nfts you might want to be able to access it using the nonce of the nft. If you only have a VecMapper you would need to load all the items in the vecmapper and iterate over them to find the nft with the right nonce. This will obviously not be possible/extremely expensive