The question of whether modern-day katanas are better than historical katanas is subjective and depends on various factors. It's important to note that traditional katanas crafted by skilled Japanese swordsmiths during the feudal period are highly regarded for their craftsmanship, metallurgy, and historical significance.

However, advancements in modern metallurgy and manufacturing techniques have allowed for the creation of high-quality swords that can rival or even surpass the performance of historical katanas. Modern-day katanas can benefit from improved steel alloys, heat treatment processes, and precision manufacturing, resulting in blades with excellent strength, durability, and cutting performance.

Moreover, modern swords can be tailored to specific purposes or preferences. For example, there are modern replicas of historical katanas that aim to capture the craftsmanship and design of their predecessors. There are also functional katanas designed for martial arts practice or cutting exercises that prioritize durability and performance.

Ultimately, the quality and performance of a sword, be it a historical katana or a modern version, depend on various factors such as the skill of the swordsmith, the materials used, the heat treatment process, and the intended purpose of the sword. It's essential to consider the reputation and expertise of the manufacturer or swordsmith when assessing the quality of a modern-day katana.