I do not know much just in learning stage so, clearing my doubt. Blockchain.info was a non deterministic and I read that passphrase also introduce risk of loss when both of these disadvantage are there in Blockchian.info why were or are users using it. Does it have some positive side as well?
Sorry, if I have miss understood.
Are you asking why people use Blockchain.info? Its used by users who dont know much and prefer a simple web interface (that can be accessed anywhere) at the cost of the most security other wallets may offer.