@ runway30
There's no way to "ban/regulate" these unfortunate happenings.
Two other things come to mind;
a) About 1200 build and about 250 went down.
b) These long span but short cord wings are very efficient at altitude but not so good for ice.
What was that other aircraft that had the exact same issues with long span and short cord wings constantly icing over? ? The ATR if my mind is not letting me down. Most where finally sold to warmer climates.
If there is something to look into, it is the icing certification.