Shawn: If there were just Red Lines, Yellow Lines and Green Lines Arcs. Chaos would rule.
Candidates preparing for check rides would not have to cram the night before a check ride in order to memmorize all the limits and therefore devote more time to understanding systems, airspace,
aerodynamics ect.
Transitions to other types would be less dificult with all the limits being standard.
For these reasons most Airworthiness Authorites would consider this completely unacceptable.