For example, Fed wants a strike called if batter steps out of the box, when he is not supposed to. What's that got to do with safety?
FED modifications usually come under one of three headings: Safety, increased particiation and speed-up. The one you've mentioned, called infrequently, comes under the speed-up heading.
Some that seem purely gratuitious would include the balk differences, the new intepretation on a lodged ball that began this thread and obstruction. In my opinon, there would seem to be no justification for the differences in those areas.
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GB
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