The wallet listing is maintained based on best practices, as such wallets which are unsafe aren't listed. A discussion on Github removed blockchain.info from this listing, pending them making promised security upgrades. Specifically, the concerns raised by the maintainer included:
Bugs and losses: BC.i has suffered from concerning issues during the past year (e.g. iOS denomination bug, weak key stretching, sizeable number of users losing funds, and more issues I haven't verified yet)
Backup/Password Security: BC.i hasn't adopted security features which are slowly becoming standard in other wallets (e.g. BIP32, random passphrases, backup on setup, rotating addresses, 2FA by default).
Transparency: Source code of the app has been reset or not updated repeatedly, making bitcoin.org often relay the false claim that the app is open-source.
Some of these are no longer the case, their new wallet does use BIP32 for example. The full discussion, where these points came from, along with detailed conversation with the developer are available for review on github.