Tasfeer constitues the ahadith of Rasul Allah (S.A.W.). How do you know how to perform salah , hajj , wudu etc. You can’t just take the Quranic ayahs on their own. Through tafseer you have a better understanding of the Quran.
It doesn’t explicitly say the word Abdullah and Amatullah in the ayah. The ayahs in the Quran are precise . So in order to actually understand an ayah you can’t always take the ayah alone. You understand it better when you do the tafseer of the Quran because that’s how you learn about many rulings .
You can check the fatwa I’m providing , which contains an ahadith from Sahih Muslim and Sahih Bukhari … The two most authentic books of ahadith . The fatwa’s given are all by scholars from Saudi so it’s one of the most authentic sites that provides fatwa.