The staking mechanism of tokens like ADA or TEZOS is that "as long as you have the asset within a wallet that is connected to validator, Blockchain will provide rewards" therefore the concept of "unstake" is unnecessary. In this type of token, you can send out partial or all tokens at any time while your wallet is staking. However, the staking mechanism of tokens like COSMOS or IRIS is that "tokens that are staked cannot be moved out of the wallet" therefore, it requires to be "unstaked" before you can send your tokens.