Too many newbies are scammed with "scam" wallets and "phishing" scams and a verified and tested wallet that are approved by the OS, will reduce these scams.
This will be a great opportunity for people to get introduced to Crypto currencies, when they install these operating systems.
This also puts a lot of trust into the OS. How do you know the OS is supplying you a correct version of the software (and not one slightly modified to benefit the creators?)