I for one don't want to start counting everything I lose interest in as a "failure", that would be too depressing. I actually think this is a feature not a flaw. You have very few attention tokens and should be aggressive in getting them back.

I think this is very different from the "finishing" decision. That should focus on scope and iterations, while attempting to account for effort vs. reward and avoiding things like sunk cost influences.

Combine both and you've got "pragmatic grit": the ability to get valuable shit done.