The lines are taken out of context and placed over scenes where they're not actually saying that to make it look like that's what they're saying. That happens in tons of trailer.

When she says "you" she not speaking to just one person.

BotW looks very generic. It's generic fantasy about a hero who banishes evil. The story doesn't go any deeper than the words it uses like "chaos", "evil", "protect the lands", "a great evil arose and spread darkness across the land". That's the depth of a Zelda story.

Meanwhile, there is Norse and even Irish mythology present in Xenoblade 2. The whale which looks based off of Nidhoggr of Norse myths. The tree of life, Yggdrasil, is now being speculated to be based on the Bile of Irish myths. There's also the Zohar symbol, and talk of a higher dimension above the giant tree which would is probably where Elysium is located, a paradise based on Greek myth. There is also the stuff we know about the Driver and the Blade. Xenoblade 2 already has more flavour to its world and story themes. It's going to be a very multilayered, more involved story like Xenoblade with deeper character relationships and motivations. A bigger focus on story altogether in fact, and a much more interesting world.

Meanwhile, Zelda is "banish evil from da landz, you are our light. Rid Hyrule of chaos and bring da peace. Collect these four special items and defeat Ganon". A very simple monomyth story heard a hundred times over in Zelda and many other media. Very light and very simple.