The bento is the brief
A homepage bento forces you to name each unit of value and rank it by size. That constraint is the reason the layout works — not the rounded corners.
Every tile has to earn its area. When you cannot decide whether a feature deserves a large cell or a small one, you have found a positioning problem, not a layout problem.
So we design the bento before we write the page. Six to nine cells, each with a working title, each with an honest size. If two cells say the same thing, one of them dies.
Do that well and the copy writes itself: the big tile becomes the headline, the medium tiles become the sections, and the small tiles become the proof points and links.
The final benefit is maintenance. A bento built from real value units survives redesigns, because the content hierarchy travels with it even when the visual style changes.