“Stand in prayer at night, except a little” (al-Muzzammil 73:2) is considered with the easing expressed near the end of the same sūrah.
The case requires distinction between an initial emphatic direction, a later practical relaxation, and the continuing spiritual value of night prayer. Simply invoking the five daily prayers does not adequately explain every part of the change.
The virtue of voluntary night worship, a potentially obligatory earlier duration, and the later accommodation of ordinary believers are different questions. Evidence concerning one must not be made to answer all three without further reasoning.