Nah. It’ll run another launcher for the purpose of running a game, but it’s intent is the game, not the other launcher, and that’s only where strictly necessary. It won’t run the launcher for things like itch games, using Galaxy can be disabled for GoG (you don’t even have to install it in the first place, actually), and there’s a plugin that uses Legendary to totally replace EGS. Then, on top of that, it’s also an emulator launcher and can launch manually-added games, no other launcher required.