It also means that another genealogist tracing a linked surname can receive a duplicate document from you at a fraction of the cost of getting it from a government office. In fact genealogist provided documentation is probably more likely to be accurate than one derived from a government archive as the person who provided it may make errors that a genealogist would be careful to avoid. A government worker is not a guarantee of accuracy. Rather than spend all that money on archival paper, etc. That also provides fire protection that would require a fire safe to duplicate with documents in sheet protectors.
Computer files are very accurate, easy to access and file.
Updating them does not require paper, ink, erasers, typewriter ribbons or other expenditures. Computers can have multiple programs to organize and simplify things. Calendars, to do lists, photo albums, in fact almost any need you can think of someone has devised a program to accomplish. That information came from that women's niece who told it to her daughter who described it to me in a letter I recently received. I include the full relationship of the entire source line in the notes on my GGGrandmother.