insistence that format string for printf to use single quotes

[Hans Lonsdale]

A work mate is insisting that the format string string for printf should always 
be enclosed by single quotes.
And that if I want variable data in my output from printf, I should insert a 
format specifier in the format string
 (e.g. %s) and supply the variable ("$var") as the argument corresponding that 
format string.

Does such insistence has any basis?

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