Tandem solar cells have gained significant attention due to their rapid advancements in power conversion efficiency (PCE) and their potential to exceed the detailed balance limit of single-junction solar cells. However, despite ongoing progress in perovskite-silicon tandem solar cells, all-perovskite tandem solar cells (APTSCs) still lag their perovskite-silicon counterparts. This raises the question: can further development close this gap? Upon theoretical modeling combining optical and electrical calculations, we found that: i) the PCE limitations in APTSCs are primarily caused by the reflection losses at the top perovskite interface; ii) introducing random texturing at the surfaces of wide-bandgap perovskites plays a critical role in enhancing light absorption, which can potentially improve PCE up to 30.97%. This improvement can be attributed to the reduced reflection and increased absorption at both the top wide-bandgap and the bottom narrow-bandgap perovskites. Furthermore, comparison between the calculated results and the experimental data clearly highlights the importance of light management strategies, particularly in improving the short-circuit current density. This approach is more effective than relying solely on interfacial passivation and energy band alignment to enhance the open-circuit voltage. The findings will provide valuable theoretical insights for optimizing and advancing the performance of APTSCs.