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I believe there are a lot of “tricks” engineers have developed to accomplish rendering goals that would be more natural with ray tracing. The added simplicity would lower the barrier of entry for more complex effects.

Rasterization will always win for primary rays. It's the secondary rays that are interesting: reflections, soft shadows, ambient occlusion.

There are hacks to do the same things with rasterization and screen space image tricks but they need to be customized with the art. E.g. shadow maps can provide fake soft shadows but all shadow mapping techniques need fine tuning to look good in a certain scene.

As the other reply said, currently lighting and shadows in games is a huge mixed bag of tricks. Raycasting would make everything simpler and more robust... and slower.