It's not. It's a video game trope that you get better gear later in the game. What people still haven't realized is that Soulsborne treats its equipment differently. All equipment on the same upgrade level are equal and it's about how you use them. Let's say 2 guys fight, one of them has a FUGS, while the other guy has a broken straight sword. Obviously it seems like the FUGS guy will win, but considering his weapon is slower and if he's stupid about timing and spacing, the broken sword guy will have way better chances than people initially assume. This is why i think videos that rank weapons in Soulsborne are pointless. All weapons have their strengths and flaws, some more than others.