Hrqls: If you miss bearing off a piece with the current roll, why would you be doing so? To save the risk of being forced to miss on bearing off at a later stage. But that's voluntarily falling behind because of something that's only a possibility.

There are times when you shouldn't bear off as much as you can. Unfortunately it's been rare enough for me that I can't think of any examples and I still have to ask GnuBg to see whether I chose correctly.