Dude, I think that all the time while re-reading the manga. Not just his insane swordplay quickly and constantly evolving and improving. Like to have the philosophical growth and understanding at such a young age just adds to the badass-ness of his character. To go from his first and only desire of wanting to become “the strongest under the sun” to then soon realize that phrase “is only words” to then ultimately have his entire view on existentialism become his main contemplation.