Metallylenes have evolved from theoretical curiosities to promising candidates for small molecule activation, demonstrating transition metal-like reactivity while benefiting from their abundance. The ability to fine-tune their electronic structure via ligand modifications has been key to unlocking new catalytic pathways, with computational studies offering predictive insights into their behavior. However, challenges remain in achieving efficient catalytic cycles, particularly in balancing small molecule activation and product release. Further exploration of quantum chemical design, ligand optimization, and reversible reactivity will be essential to harness the full potential of metallylenes in catalytic applications. As research progresses, these species may redefine the role of main-group chemistry in sustainable synthesis, offering new approaches to bond activation beyond traditional transition metal catalysts.