When I got into creating lenses, I was upset to see I could only restrict my searches to those specific sites, and not just let those sites be more prominet alongside other sites that match the keywords. It would be nice to have a lense for sustainable fashion for example, that not only features sites I know, but introduces new sites that contain specific keywords I set. 🙂
I think this would help existing users not be restricted to a limited set of sites just because they have a specific search in mind, and introduce them to things outside of their bubble even if they use a lense.