Girls, What is the point of leggings with a built-in thong?

Girls, What is the point of leggings with a built-in thong?

I found this website selling leggings with a built-in thong: https://www.cosmolle.com/products/built-in-thong-soft-smoothing-legging?variant=40595058622553

But I don't get its purpose. Does anybody have them? What is the advantage of having a built-in thong contrary to regular leggings worm with a thong underneath?

Girls, What is the point of leggings with a built-in thong?
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