They further state in the rule book : "An emergency is defined as an unforeseen combination of circumstances, making it impossible for a team to field a legal lineup. The reasons for not being able to bowl would not have to be catastrophic; just beyond the control of the team members." That's just brilliant.
Yeah kind of agree, the wording could be a little bit better on this, especially the last statement.
In the end we know that people are just going to give the acceptable excuse (truth or lie) for their reason not to bowl. It would be pretty stupid for someone to tell the league their reason for not showing up that night was "I just didn't feel like it!".
In my local association this issue is split between members. There are some very diehard bowlers that strongly believe you should only bowl the night you are scheduled, and others that look at league night "not as important" versus other things in their life. If they can't make it to the scheduled night, just bowl on another night. No big deal.
Maybe the USBC leaves things open ended in this instance to accommodate everyone.
In my opinion this rule should be clearly defined for every league. It should be voted and discussed within each league every year. The main and biggest reason for this is because it affects the bowling center.
Issues with Pre/Post bowling occur when a league has no rules on this and everyone looks to USBC rules. That first statement causes an uproar, because most pre/post bowling is "Individual unopposed".