most spam is still required to be stored, such as the utxo bloat. pruning means you can't verify your own txs if they are far back enough and we need full nodes to bootstrap new nodes.

A bitcoin node still downloads and validates all transactions and blocks, even if pruning is enabled. And if you set up your node to track your wallet history, it will store those transactions even if they're past the prune period.

No, a pruned node verifies everything, no matter how far back it is.