Avira,
Where are you getting that from the Ramban? He is saying that when the posuk uses the word “knowing” it is referring not to literal knowledge but to Hashem’s hashgacha. For most people this is general hashgacha. But for the righteous the hashgacha is over every prat. Hashem is constantly guarding the righteous.
According to this Ramban, when a person experiences hashgacha pratis over a small issue it is a wonderful sign. A smile from shamayim that the person is doing the right thing in life.
Yes, Rishonim need interpretation. But the interpretation can’t be that we just don’t hold from these Rishonim unless we have major Rishonim against them. The Ramban repeats this opinion in multiple places and explains a bunch of pesukim according to this shita.
Note, believing that things “just happen” is not the same thing as this Ramban. Hashem set up a briya with rules. And there is definitely hashgacha klalis on all people. But if a person is not zoche they are subject to the rules of the briya as Hashem created them.
This mehalech leads to people striving to get close to Hashem. To keep the mitzvos. Because they want הנה עין ה’ אל יראיו.