AMAZING!!! I saw this in videos and screenshots so it’s the first thing I checked!
I’m excited for your excitement! What does this mean? Lol I am clueless why this is such an amazing improvement.
You used to be only able to delete the last filament.
You previously could only delete the last added filament, so if you are experimenting or working in a previously used file could have multiple filaments not needed. Plus when importing OBJ files with vertex color (eg from TinkerCAD) sometimes too many duplicates get added, often making it annoying, or difficult to change just one color, or sometimes making it impossible to change one color without affecting several other pre colored items. It also allows you to curate your color palette when painting, and lets you decide to use a single color for two and consolidate them (merge) without having to keep multiple instances.
Some also have experienced when including duplicates that it can make the prime tower unnecessarily larger for 2+ of the same color wipe, and even make prints take longer swapping the same color twice or more because they were duplicates in the slicer.