وَيَنْبَغِي لِلْإِمَامِ أَنْ لَا يُطَوِّلَ بِهِمُ الصَّلَاةَ.
Meaning: The imam should not make the prayer overly long for the followers.
Moderation avoids undue burden on vulnerable congregants. Shortening here does not mean omitting obligations or rushing past valid performance.