If you make a game with Unity, you have productized the graphics. It does not matter at all that Unity has millions of dollars or thousands of person-hours built into it. The game developer paid the asking price. Everyone was compensated. The game developer didn't somehow unfairly "take" the hard work of the Unity devs.

From the point of view of a game developer, having good graphics is "easy" because Unity and Unreal exist. The fact Unreal and Unity exist enables thousands of developers to make games that couldn't otherwise. Making a "point" that a small game developer didn't write their entire stack is just shitty gatekeeping.