In the longer term, yes. Plus you can use eth2 in defi (e.g., for lending) to generate additional yield.

No you can't.

You can't do anything with Eth2 that is locked. Some pool staking services offer a token for each ETH staked, but you can not use the staked ETH.

I was referring to longer term developments, in case this is unclear.

Using staked ether in the defi ecosystem will be possible once withdrawal and smart contract functionality is enabled. Until then, there are liquid staking services that offer eth2 derivatives that can be used in defi, as you point out.

You can always take out a loan against your stakes eth2