confused

As a Sunni, I think you need a more complex argument to understand why you should not follow hadeeths.

Argument 1: There are numerous places in the Quran that give the Quran sole authority and that say that nothing has been left out of it.

Argument 2. Many prominent and early Muslim scholars, though some are in disagreement, have stated clearly that Aahad hadeeths (anything graded Sahih and below) are conjectural and do not impart knowledge and certainty because it is possible for them to be false, not only content but also reputation of narrators and actual narrators. Mutawaatir hadeeth can actually impart knowledge and are not conjectural, this being the way that all authoritative readings of the Quran have been preserved (about 10 readings). The same reason that an Ahaadi narration of the Quran is not acceptable as being authoritative as a Quran, nor should any Aahadi hadeeth. With this said the Quran clearly tells us NOT to follow conjecture and NOT to follow what we have no knowledge of.

Mutawaatir/tawaatur: a status that implies that so many people narrated a hadeeth at every level in the hadeeth that it is impossible for them to have agreed upon a lie.

Aahad: a status where only one, two or even more than two people narrated the hadeeth at any step in the chain, and by deduction where there could possibly have been agreement on a lie. They are classified using the terminologies mash-hoor, 'azeez and gharib as their penultimate classifications and 'saheeh', hasan, da'if and mawdu' as their final classifications.

those considered atharis believe that even aahad hadeeth that are classified as sahih can be accepted as autoritative. Others say that aahad hadeeth are obligatory for actions but not belief because they are conjectural in nature.

But as I told you before the quran tells us not to follow conjecture and many prominent scholars have shown us that ahaad hadeeths are conjecture.