‘That’s assuming you can see the wings…’
Perhaps that’s why Airbus have taken the initiative to provide the crew with more information. But even with this information the crew actions and continued reassessment is vital.
So for Severe Icing detected, both anti icing systems are used; but do not forget that there still are conditions, intensity, duration which could affect systems and engines, beyond the tests and assumptions in certification.
The OP ask about other aircraft; so if you cannot see the wings in B or any other type of aircraft, how might the crew detect the difference in icing intensity, and how is this related to other parts of the aircraft.