[delecti]

I don't think many modern DLCs are equivalent in scale to old-school expansions. They would generally nearly double the content of the original in a single expanded story. Some modern games collections of DLC (so collect all of the DLC of Skyrim or Witcher 3) would be roughly on-par with an expansion, but even then they tend to be multiple mostly independent pieces of content rather than a large cohesive addition.

In that sense, I think (from what we've heard), BotW's DLC is not really an expansion pack in the old sense.