OK, long-dated tweaks would make it perfect

Scapple has no competition when you need to capture and make sense of a lot of ideas or bits of information.
Works better than an outliner for problems that do not have a well-understood structure because it lets you visualize things and move around bits and pieces like a mindmapping tool.
Scapple works better that a mindmapping tool if the chunks of information you need to visualize are text with dense content (not just one-word concepts), notes, paragraphs, tec. Some people use it as a drafting tool, juggling around paragraphs, for short prose, speeches, essays, etc.

The only issue, which is getting really old, is that it has very poor graphical elements. The straight lines and arrows do not blend well unless you have a very rigid layout. It is a pity, because Scapple is great to put together networks of data with lots of connections, and the straight lines become a distracting visual nuisance. A little tweak to use softer curves (simple Bezier or splines) would elevate Spline’s original but dated interface to the level of a killer app.

I am consistently more productive using Scapple than any other outlining tool; I can work fast and focused even if the end product is an eye sore.

the sheep are speaking about Scapple