In Quebec, everything points to the upcoming integration of advance requests for medical assistance in dying (MAiD) into provincial law. This would allow people with neurocognitive disorders to determine, in anticipation of loss of capacity, the conditions that they believe justify the provision for this end-of-life care. Based on an overview of the literature, we highlight the paradox of extending MAiD to this population, while their participation in research projects on this issue remains limited. We present a Quebec study on MAiD in the context of advance directives, in which the inclusion of people diagnosed with a neurocognitive disorder is valued. We outline the methodology initially envisioned to include this population in our study, as well as the challenges encountered in doing so. Then, we share how the social work perspective allowed us to overcome them. Lastly, we argue that the quest to include so-called vulnerable populations in scientific research on MAiD should be pursued as fervently as the quest to expand this end-of-life care.