The reason you should buff instead of nerf is because all meaning can be controlled by context and any overall effect of nerfs can be achieved with buffs because all games are math. All games are power fantasies. (Primarily war stand-ins which amount to immortality fantasy. “Look I can be in war and not die!”)
And this means that nerfs defeat the purpose of any game to the exact degree they are deprivational while buffs bolster it. More power in a power fantasy is always better. It’s that simple.