Also of note: People who are strictly "flow mappers" will probably have to adapt their style and get used to using more symmetry, or at least more balanced patterns. Remember that the maps need to make good use of both hands. Patterns will also need to be pretty, because of polish and, believe it or not, some customers actually whine if a map isn't pretty enough.
It may be that some people would have to rethink their style entirely, because slapping together a load of formless patterns in a vaguely balanced fashion will not result in a good map. That's just how it is.