One objection I have to the kagi smallweb approach is the avoidance of infrequently updated sites. Some of my favorite blogs post very rarely; but when they post it's a great read. When I discover a great new blog that hasn't been updated in years I'm excited to add it to my feed reader, because it's a really good signal that when they publish again it will be worth reading.
I'm with you. Also, sometimes I'm specifically looking for some dusty old site that has long been forgotten about. Maybe I'm trying to find something I remember from ages ago. Or maybe I'm trying to deeply research something.
There's a lot more to fixing search than prioritizing recency. In fact, I think recency bias sometimes makes search worse.
To clarify criteria is less than 2 years since last blog post.