As suggested by AlphaVictorFoxtrot , reintroduce FIS and MBZs . Back to the future ! Crazy idea isn’t it !
Normalization of deviance is fatal in aviation.
Somehow over the last 20 years we have convinced ourselves that the airspace structure is ok , or worse that it is “world class” .
It isn’t . Never has been.
Pity it takes a disaster to make it obvious.