Explain the problem as you see it
As you input information in Tana, your life goes through changes that diminish the importance of some of the dated content (like old projects, people from your old work, etc).
But whenever you want to fill in an instance field or search for nodes from a specific supertag, all your content gets surfaced (unless you create a specific way to remove unwanted content).
Why is this a problem for you?
I like the simplicity of instance fields (for example), but the only way to get rid of dated content is to untag the nodes or build your option field with search nodes.
Suggest a solution
We could have a configuration for nodes to mark them as "archived". By default, archived nodes wouldn't show up in searches, unless you explicitly search for them.