[Imnimo]

This reminds me also of this paper: https://www.pnas.org/doi/pdf/10.1073/pnas.1115585109

"The allocation of all metabolic resources to maintenance purposes limits the size of the smallest prokaryotes and largest unicellular eukaryotes, whereas an inability to meet the ever-increasing biosynthesis rates limits the largest prokaryotes and smallest unicellular eukaryotes. Metabolic constraints for larger eukaryotes are relieved by alternative reproductive strategies and multicellularity."

[RataNova]

That framing makes the article feel even more interesting, because it's not just "cells are small because diffusion gets slow". There's also an energy budget behind it