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Netakure
user87951
zmjones_
The purpose is to reduce friction around the jockeys. A larger cog provides less friction as the chain does not have to rotate along such a tight curve. And the bearings in a OSPW are usually ceramic adding to this effect.
Less friction = easier pedalling
See this article about the Trek Segafredo team using bigger rings to counter the effect of the small Sram AXS cassettes:
https://cyclingtips.com/2020/01/bigger-chainrings-for-trek-segafredo-but-not-for-the-usual-reasons/