In the business context, the archived records are expected to get low use. Relatively few searches will be performed by lower paid clerical workers during regular business hours. The images can be roughly organized to reflect the file structure of the business's paper documents. With those rough guidelines, the clerk can spend time paging through electronic files to find the requested image. Business users can live with slower searches and get by with little or no indexing of the imaged documents.
Litigation is different.
There will be hundreds of searches over a relatively short period of time. They will be performed by highly paid professionals who will be exercising judgment. Evening and weekend work will be common. Most importantly, rough inventories based on file structures will not be adequate. If prior business-record file structures exist, they will be irrelevant to the types of searches attorneys and paralegals will want to do.