I wouldn't include any raw private keys, though. This simply encourages people to import them individually
On the other hand, if you have many funded addresses, it's much safer to import one private key than the entire seed phrase. How many people are really creating an airgapped secure setup for that?
By importing just one key into a hot wallet, at least you're not risking all your funds at once.
But the paper wallets created by such websites are outdated and should really no longer be used at all.
Agreed. Bitaddress should update to Segwit. There are some other sites that offer it, but I don't trust them.