and sometimes I'm open to looking
An accurate setup made from scraps can help you salvage lumber that is too crooked to frame with but could be great for blocking or furring strips
Frank Howarth needed a new door for his pantry, so he turned to some Sequoia slabs that he and a buddy cut up a few years ago.
And then he made a film about it.
Use scraps to offset the straight edge allowing you to cut each edge of the dado with opposite edges of a router bit
One of those things that you keep forgetting how to do, because you don't do it that often