Madthabs VS Quran n Sunnah

I’m always question myself is the Muslim obliged to follow a Fiqh Madhhab??? I think Islam does not require the Muslim to follow one of the four Madthabs. The Messenger SAW only called us to follow Quran and the Suunah. If a person is able to make verdicts and look into the evidence then he must follow the evidence and not a specific Madthab. As for the one who does not reach this level, then he must ask the people of knowledge, as Allah the Exalted says: 

“…Then ask the people of knowledge if you do not know” [Surah An-Nahl - 16:43]