That's because TOTK is designed to run on it, with careful compromises and a lot of manual tuning.

Nintendo comes up with a working game first and then adds the story - BotW/TotK are post-apocalyptic so they don't have to show you too many people on screen at once.

The other way you can tell this is that both games have the same story even though one is a sequel! Like Ganon takes over the castle/Hyrule and then Link defeats him, but then they go into the basement and somehow Ganon is there again and does the exact same thing again? Makes no sense.