Big Sur is, somehow, the exact opposite. Corners are rounded off as if they could hurt someone, and margins are padded more than a cell in solitary confinement. Space is wasted everywhere. It's Fischer-Price design philosophy and I'm hardly the only one to point it out.
In a side-by-side, so much screen real estate gets wasted that it's genuinely disgusting: https://www.andrewdenty.com/blog/assets/img/macos-new-ui/fin...