That's what raster graphics mainly is. For having played around with both I can you that offline path traced graphics are easier to work with. Here's a perfect picture to illustrate the hurdle of making a mirror in games. In offline 3D this is super easy to do: make a reflective shader and you are done.
It's not as pejorative as it sounds, even movies are making use of tricks sometimes to optimize the render time. But Raster isn't the Top-end of CG, it can look very good, but there's drawbacks to it when it comes to accurately depicting the world. Otherwise, it would have been far more popular for rendering movies. The Witcher 4 trailer in UE5 looked really good, yet UE didn't make offline renderers obsolete.
How Do Mirrors in Video Games Work?
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