After I ran my head against math for some time and actually noticed changes to my mind structure, I am sceptical. Studying math is not (just) about the knowledg

After I ran my head against math for some time and actually noticed changes to my mind structure, I am sceptical. Studying math is not (just) about the knowledge you gain, it is about the reasoning structure behind it, like a workout for the brain. Learning things is not (just) about the facts you know afterwards. I read so many books I forgot at least half of what was written there, but my worldview and thinking was altered from that. Not that the other stuff isn't very important too of course..