An Australian team has been studying how to best grow vegetables by experimenting with pak choi in urban gardens. They found that canopy cover and garden richness, rather than pollinator visits are the key factors in improving yield.
You can read the original post at https://www.botany.one/2022/03/study-in-sydney-reveals-that-preserving-pollination-is-more-complex-than-boosting-bees/
You can read the original research at https://doi.org/10.1111/1365-2664.14136