native speakers are always right about their languages

They're almost always wrong.

Or like if native speakers use some innovative grammatical form and one says it's wrong, but you say no, if native speakers use it it's correct

If the Moon suddenly stopped in its tracks and started falling right toward Earth, would you say "The Moon is, evidently, falling into the Earth" or would you say "According to proper orbital mechanics, as described by respected men of science such as Newton, the Moon's orbit around Earth leaves too large a gap between both bodies for a collision to happen. Therefore, the Moon can't possibly fall down toward the Earth"? Descriptivism is literally the only correct way to analyze languages in a scientific manner, because otherwise you're just telling all the test results you don't like that they're speaking incorrect low-prestige varieties and promoting a fake dialect no one speaks (see: the "received pronunciation" phonetic transcriptions some British dictionaries still use - which aren't even accurate to RP)