I think it's only smash 64 as a matter of tradition and also because comboing is slightly more skill based in that game with more limited movesets and lack of c stick. Plus there's more hitstun in 64 so a lot of these are just naturally true combos.
@@queuedjar4578Its not that its more skill based, its just that the comboes are many times completely unescapable therefore they form a bigger part in the meta game