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The iPhone log is also globally accessible to any running app, so be careful what you're writing to it in production code.

It's just laziness on the part of developers: it's trivial (on both platforms) to have your logging disabled or filtered on production builds.

and yet, accidents happen. Sometimes it is not wrong to use overlapping security measures.

[edit: unintentional use of slang]

"Defense in depth" is the usual phrase.

"Belt and suspenders" means something totally different in British and Commonwealth English - the mind boggles.

Or, rather, simply never commit code that logs authentication credentials, in production or otherwise.