Disadvantages of First-class functions [closed]

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Are there any disadvantages to having first class functions in a language?

Joel in this entry says

Object-oriented programming languages aren't completely convinced that you should be allowed to do anything with functions.

I might be naïve here, but why don’t all languages support first class functions if there aren’t much issues

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In an ideal world where there was never a cost associated with developing new features, the only downside I can see to including functional programming techniques would be confusion to developers who are not familiar with functional techniques (and I don't really see that as much of a downside).

In reality, treating functions as first-class typically requires significant rewrites to the compiler itself. The cost of doing this has to be weighed against the long-term gain.

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Adding this feature might be a disadvantage if introducing the change requires a costly re-write of language compilers, interpreters, and other tools. It might also be a disadvantage if the language's culture is not familiar enough with the advantages provided by this feature in which case adding the feature is a waste of effort.

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Additionally, first class functions require runtime interpretation of code and some form of garbage collection. Both of these add overhead that might not be suitable for certain problems and languages.