Health – it doesn’t say that women can’t learn Torah, only that men can’t teach them Torah. Also, it’s only referring to certain parts of the Torah (that men can’t teach them) so they can still use their brains learning the other parts. And the Rambam says that women who do learn Torah Shebeal peh get schar for it. Which has to be explained since he just said that women aren’t supposed to learn Torah Sheb’al Peh. One common explanation is that even though most women shouldn’t learn Torah Shebeal peh, there are some women that should, and those women get schar for it.
Bottom line is that Chazal do not say that women can’t use their brains! As one of my rebbeim once pointed out, you can’t be a good Jew without using your brain. You have to constantly be using your brain in order to figure out what the halacha or correct thing to do is in every situation you are faced with every second of the end. And knowing the halacha in every situation is not a simple thing!