I disagree. They are allowing us to cancel flights almost up until take-off.
I don't blame them one bit for not making it super easy to use those funds. And yes, I keep excellent track of mine and none ever go to waste.
I believe WN allows us to re-use funds because of the breakage associated with the TTFs; with people who don't keep good track of said funds. So I'm not in favor of tracking made easy. Breakage keeps this profitable.
Keep your records, people!