I organize trips for families, often with small kids. Other parents end up asking me advice for good routes for families with little kids. I want to send them a link and say something like, "Check out any of the routes that say 'family' at this link."
Now that I capture maps for most of my trips, there are other cases where I might want to share all of my trips with an aspiring backpacker, so that can check them out and decide if they might want to do one of the routes themselves.
The key is to be able to share more than one at a time. Sure, I could -- and have -- sent a bunch of links to routes, but even that is a little tedious because the I have to copy the names and descriptions separately.
By being able to share a list of all of my public routes easily, I would be able to help other backpackers find neat things to do (without a bunch of c-n-p) and probably get them excited about caltopo in the process. :)