Depends if you value industry standard employee skills, or premium support, or ability to launch on consoles without hiring a third party to port it. Yes, it's proprietary, but they're old and reliable, and swimming in so much Fortnite money that you can reasonably expect them to be there for the lifespan of your project.

If you're a lone wolf game developer and can't afford support or salaries for others, then Godot will be just fine. Your business plan is likely just "make a cool game and see how it does".