I find that a very empty commitment. Firefox sends diagnostic reports by default (for every user) and it defaults to Google Search. It also accepts all cookies by default. At least Safari blocks third-party cookies by default. I also find Firefox’s settings menus (and Chrome’s!) pretty terrible and it is easier to configure Safari from scratch.
I don’t think there are particular risks with Safari, but the browser is not the privacy enthusiast’s first choice. You cannot set the user agent to something else permanently and I think Apple could do more about cookies and local storage. I am currently using the app Cookie to periodically delete cookies and local storage from my non-favourite websites. I think it is absolutely shameful that browsers keep all cookies until they are either cleaned manually or expire (many websites set ridiculous expiration times, such as 10 years). There should be a middle-ground, such as a reasonable, maximum expiration time and an option to keep cookies from websites you have in your favourites or visit frequently.
How do you like the cookie app? I am currently having a problem where when I delete all my cookies and website data in safari then moments later it all comes right back. I can't seem to permanently delete all my cookies. This only happens on my Mac Pro. On my MacBook Pro when I delete the cookies they stay gone.