"The search engine does not work properly with US City Directories, due to poor character recognition."
That has nothing to do with the card catalog.
"How will newbies know that?"
The same way anyone does.
"You're arguing that less info is better....? I still don't see why less is better."
No, I'm saying that adding nation wide collections when someone only wants to see local collections would make the card catalog useless. I don't know how many times I can say that until you understand it but I'm tired of repeating myself.