Even if they didn't automatically hide my old email address, merely making the @facebook.com one visible on my profile is an anti-feature. So no, the problem isn't that they automatically switched my visible email address, it's that they enabled a "feature" for me at all that turns out to be an anti-feature. Removing my real email from my profile was just the icing on that shit sandwich.
It's ludicrous to call that an "anti-feature." The feature may very well have been active on your account for years without you even knowing. Yet again, the only bad thing is their choice to replace your personal email address with their own.
