It's illogical to say "Not that many people use the catalog, so it doesn't matter how it works." Maybe if it were comprehensive, then more users would use it?
Sorry, I'm an information junkie -- MORE info is always better, not less! To me, Ancestry.com is an online library. The MORE ways to find MORE info, the better.
Yes, Jane will probably also type names into the search fields -- but when her ancestors don't come up from the Amsterdam directories due to poor character-recogition in those books, and the resources don't come up in the card catalog -- How is she supposed to know that she's missing something? If she has a free trial, for example, she may just say, "They don't have the info I want..." and give up.