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In this particular case, resist the temptation to simplify. Macro parenthesization is critical, and should be second nature for anyone who wants to play around with them.

"Simplicity" is not a good thing when it introduces confusion and errors.

This seems like a little detail that there's no harm in including, especially since you focus so much on macros, and this is kind of macro 101.

Yes, I get your point :) The post doesn't focus on the preprocessor actually, its just that there's more to explain in it which people usually neglect. So I've somehow written more on the preprocessor which looks like I've focused on it.