The old system of being nabbed at short notice (Draft Assign) allowed a bit of wriggle room and an opportunity to avoid if you really had to be at home over the days in question. That avenue has been closed and that seems to be causing some very real problems.
So when you wriggled out of a draft assigned trip, presumably someone with less good excuses would pick it up?
I'm not trying to be flippant btw - just trying to understand the issues.