Honestly, Smash's cuts have always made sense when you think about it.
Melee to Brawl? All the clones and Mewtwo who was an unfortunate victim of time restraints. We even know that he, Roy, and Dr.Mario were being worked on to come back.
Brawl to Smash 4? Icies due to technical limitations of the 3DS and Snake due to Konami being in a bad spot. Lucas was cut out to put in as DLC, and Wolf was a super last minute addition to Brawl.
These all make sense. Even Mewtwo's Brawl cut makes sense when you realize they were going to put him in.
Nasb2 cuts make zero sense.