Social simultaneity describes individuals active in multiple social contexts. Migrant networks serve as a case study where social network analysis (SNA) has recently been applied to evaluate their assimilation and transnationality. Yet, networks are sometimes insubstantial, as all nominated nodes and bridges are part of the network graph except they are not part of the social grouping. This research attempts to look beyond the social networks metaphor as it reviews critical group size theory and complements SNA with network survey and ethnographic interpretation. The article questions the structural approach and argues that interaction among alters may not be accurately recorded by this method. A respondent‐driven sampling method was used to select and survey 55 egocentric networks out of some 248 Romanian migrant networks in Spain. Results endorse precautions of critical group size theory that do not fit prescriptions of SNA. Resilient social networks and strong reciprocity and exchanges support the moderate transnational space types within the surveyed case. The article concludes that smooth social embeddedness and neoteric cultural diversity eventually reveal characteristics of third‐generation migration in Europe. Despite this, the number of Romanians in Spain decreased at the end of COVID‐19 pandemic.