Yes, I agree, those who are already interested or motivated need less help.
But to educate most people, and young developing minds especially, brief browsy exposure to unplanned topics is what might create the interest and motivation in the first place. The peripheral glances at compelling covers and spines. The topics you didn’t come to search for and maybe you didn’t even know exist.
You can’t search an opaque virtual library for what you haven’t yet seen a spark or crumb of. Hands-on, tactile, flip flip flip, put it back, flip flip flip … irreplaceable.