PIN Backups which are 4-8 character long can be hidden indistinguishably anywhere. As compared to seedphrase backups which are exponentially much more difficult to hide.
PIN code is saved on device and that means that it can be hacked and extracted, it's just a matter of time when this will happen.
Advantage of additional passphrase compared to PIN code is that it is not stored anywhere and it can't be hacked.
I am not saying PIN codes are bad for hardware wallets, but I wouldn't trust them to keep my coins safe.
User can export seedphrase from X1 and it takes under a minute to do so. X1 being BIP-39 compatible means it works with all the mainstream software and hardware wallets and users can seamlessly shift from X1 to any other wallet, or vice versa.
OK, it's clear now.
Thank you for clarification.