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How to batch-send multiple transactions
CLI: transfer address_1 amount_1 address_2 amount_2...
RPC: transfer / transfer_split destinations array.
So if you want to batch transactions (though this is a moot point given how low Monero transaction fees are), you must use either standard addresses or subaddresses. You can still use a payment ID, but only one.
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You can't delete accounts/addresses.
That said, if it's bothering you that much, you can of course delete (move/backup first) the wallet and restore a new one from seed words, which will restore your wallet without recreating unused accounts/addresses. Be sure to backup your current wallet so you have access to things like tx private keys, labels etc which ...
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