As is the case with the dark below and the hive spawn this is nothing new. The same will happen in dlc 4 and it felt defeats the purpose of having dlc when they remove a major part of its core to replace it with something in a newer dlc that works similarly. There's also no point in keeping the past 2 dlcs and they should just remove them and leave pie and raids since that's all we'll port much be able to do in 2 weeks.