A promising new wave of team science studies are mitigating some challenges of external validity and reproducibility of research. While team science studies are a promising step forward to understanding any scientific phenomena, larger samples often mask the lack of within-region diversity within each country. This talk articulates the perils and promises of big team science scholarship with a focus on increasing sample diversity and calls for more epistemic humility. Despite recruiting samples from multiple countries, languages and cultures, most research still relies on the educated elite, missing a critical perspective of rural, uneducated, poor participants that may not even be digitally connected. Neglecting these hard-to-reach populations severely threatens generalizability and undermines our scientific credibility. Further, the definition of diversity may significantly differ between the Global North and Global South and we urgently need to make more calibrated claims when advancing research on underrepresented samples.