Well, since personalized results blocked domains is not working, I've not actually tried making lenses work. Do they work now?
Some of my work is performing bioinformatics analysis on genomics data as a collaborating member of a ongoing scientific project which may last years.
Often I am engaged in a handful of different such projects.
I could well imagine having a lens for each project.
Indeed I could well imagine wanting the ability to have a project lens to which all project members might collaboratively contribute.
Further, I could imagine wanting to have a lens being pdfs of all papers I have read as background to the project.
Actually, I am using SciWheel collaboratively on such projects. Project members add references to interesting project related papers to a shared cloud based repo, allowing mutual annotation (think yellow highlighter with notes in the margin) to occur in the cloud. There is an API to SciWheel from which URLs of discussed papers might be pulled to serve as a dynamic ever-updating lens as the project goes forward.
Of course there would be issues with IP & copyright, but you get the idea.
I'm not sure if this is pie-in-the-sky thinking. But you like such thinking. I find not many people want to collaborate in such fashion, but some do, and that number is only growing.
So add "Collaborative Lenses" to my hopes.
And an API to lens management.