The point of it…
To save time typing in complex searches.
You may want to do a standard search repeatedly on different sub-corpora.
Or as Concord allows an almost unlimited number of entries, you may wish to do a concordance involving many search-words or phrases.
The space for typing in multiple search-words is limited to 80 characters (including / etc.). If your preferred search-words will exceed this limit or you wish to use a standardised search, you can prepare a file containing all the search-words.
concordancing from WordList, KeyWords etc.
Automated file-based concordances
If you want Concord to process a whole lot of different search-words, saving each result as it goes along so you can get a lot of work done with WordSmith unattended, choose SW Batch under Concordance Settings. See also: scripting.