 Eukaryotes are organisms characterized by intracellular complexity, and in particular, by the compartmentalizing organelles within their cells. Most prokaryotes do not exhibit the same degree of compartmentalization (however, cf. Murat et al. 2010). The majority of eukaryotes are unicellular (Burki et al. 2020), but the macroscopic ones are almost all multicellular and often conspicuous. It is very common for scientists and philosophers to consider bodily bulk and multipart complexity as phenomena of evolutionary importance (e.g., Carroll 2001). Although there can be many ecological reasons that sustain that impression (i.e., the sheer impact large organisms have on environments; see Enquist et al. 2020), recent findings about the origins of eukaryotes might temper that view at least a little.