you know that modern monosteel katanas are stronger than traditionally made katanas. it may not be made traditionally but I prefer to have swords that don't bend
A common misconception that some believes is that Yoriichi's katana is red, Yoriichi's original color of his katana is Black like Tanjiro's, it just appears red due to him gripping his katana so hard that it turns color red. You can see the same thing happens on Muichiro and Obanai's katana during the final battle.
