Prophet Muhammad peace be upon him is a real teacher to us whose life is an open book full of lessons that can teach us how to attain success and happiness both in this life and the hereafter.
Reading his great seerah strenghtens and increase our love for him.
Peace and blessings of Allah be upon our beloved!!!
Peace
Alhumdulillah,
And to reiterate and to add to what Peace said.
We study seerah to know how to follow the Messenger pbuh, what it requires from us to please Allah. because we get that love that attachment of Allah from following the Messenger pbuh.
Achieving the love of Allah which can't happen without following and knowing His Messenger and we can't follow him without knowing his life and how he interpreted the Quran.
It also as you said give us the Islamic rulings concerning issues, and how and what muslims are to respond and do. for remember Quran was revealed over the lifetime of the Messenger of Allah pbuh and we need his seerah to give the correct tafsir for the seerah is part of the context. The Life of the Messenger is the interpretation of the Quran, and finally the seerah assures the believer in his heart. It shows us the Mercy, the Power, The Infinite Wisdom and Compassion of Allah swta upon us as muslims. It affirms us and assures us that he is the Messenger of Allah.
Masha Allah, Peace I am thankful and grateful for you answers may Allah guide us and make it easy on you and me and the rest of the Ummah, Ameen.
Asalamu alaikum
Mujahid