Other than earning liquidity mining rewards (CRV, LDO, alongside trading fees), staking rewards are still rewarded - though, they are rewarded to the pool rather than the users' wallet. As your deposit to the stETH/ETH pool is split 50/50, you will only be earning Lido staking rewards on around half of your deposit if you deposit 100% stETH.

Because steCRV LP tokens entitle users to their share of the increasing pool, users would essentially be able to withdraw more than their original deposit assuming that the exchange rate between stETH and ETH remain the same.

Things to keep in mind are people arbitraging between the pools - which may offset staking rewards.

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