I think it is pointless to be worried about metaphors to the point of not using 
them. Taken to extremes you would eventually be unable to communicate. To 
communicate, you have to use language the same way your audience uses it. 
Otherwise you are going to spend a lot of time re-explaining common words.

If you are speaking to a software professional about bugs, they know that the 
meaning of that term includes errors. Further, the word bug covers things which 
are not strictly speaking, an error. (The original moth from which the term bug 
is coined, for example. You can argue that it was an error that the moth was 
able to get in there, but that aside, there was not an error with the hardware 
design or the software design. The "bug" was that the hardware was failing due 
to the presence of a foreign object.) 

I think it is better to accept that humans speak in and use metaphors. 
Metaphors have limitations and pitfalls, but they also have advantages. Make 
use of the advantages, and manage the limitations. This is what we do with all 

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