Are NLS1 intrinsically young AGN, or are their properties shaped by external factors in their host environments? In this talk, I will explore the "nature versus nurture" paradigm as a framework to interpret the multi-faceted characteristics of NLS1s. On the "nature" side, I will discuss intrinsic features such as low black hole masses, high Eddington ratios, and compact emission-line regions—interpreted by many as signatures of early AGN evolution. On the "nurture" side, I will show how spatially resolved spectroscopy with MUSE and near-infrared data from JWST and ALMA reveal the influence of host galaxy kinematics, secular processes, and feedback. These observations highlight the importance of coupling ionized and molecular gas diagnostics to capture the full picture of AGN-galaxy coevolution. I will also present prospects for the ELT era, where instruments like HARMONI, MICADO and METIS will provide unprecedented resolution to disentangle nuclear fueling and feedback processes.