It makes them look imprtant and justify their exorbident salaries.
Also, if they were in the garage they might be in danger of having to mingle with dirty smelly bolties
Mind you, if they stayed home to do their job their is every chance of being distracted by their dog chewing the network cable or something.
The most useful function for being on the pit wall is that it is easier to find someone to blame when you lose if they are all in the same place.
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