Icing has always been a risk of all times and all types of aircraft. It is a systemic issue that just like gravity demands awareness and attention.
If I take a database with 2200 cases dating from 1956 to 2021, there are at least 98 cases of all aircraft types where icing alone (not including snow/precipitation contamination cases) was a factor, in at least 42 cases icing was causal, in 35 cases there were fatalities, in 32 cases the aircraft was written off or destroyed, the number of killed/serious/light/uninjured 1800+/200+/100+/1600+ of 3700+ PoB,
My impression is that icing got more recognition in the 1940s... icing is mentioned in many cases during WW2... One early very good report (you could use it today and most would not recognize it as being written that long ago) dates from about the 1950s if I recall correctly, but I would have to check that. Report included a very good sketch of horn-type icing on wings and horizontal stabilizer by the incident's pilot.
The US system got a warning in for example 1982 with the Air Florida 737. The 1989 case pointed out a systemic failure of the Canadian aerospace system (crew, airline, regulations, knowledge,...) and not a specific aircraft,