She was used by editorial yes and yes Avengers Dissasembled was done to rewrite the Avengers in a more "modern version" with Spider-man and Wolverine as members but decimation itself was done because apparently they thought Morrison run left too many mutants to be a minority so they had to scrat them off but imo this doesn´t make sense because even then mutants were way more less in numbers than general humans and in the end decimation at first was thought to be an event that would not last much but then it took years and years and here we are and in the end I don´t think it really helped X-sales or storylines in general, many readers got tired of decimation and apocalyptic events. Imo this is also why this particular event is harder to get over with because it´s consequences were left open for a long time and when it was addressed they were don so in a biased way.