We don't really know how scripted the time/weather will be in GT7. It should be noted that such systems can be both dynamic and scripted. Dynamic simply means it keeps changing over time, but all these changes can be scripted and then the system has them play out in real-time, instead of jarring, sudden changes. The marketing materials make it look complex, but we have to remember marketing is marketing, and only once we play it, will we have an idea. Even then, only Polyphony will know the details of the implementation.
However, considering the game will have highly competitive e-sports, and will allow crossplay between PS4 and PS5, they don't have a choice but to make sure dynamic time of day and weather, work on both. Unless those features won't appear in Sport mode. You cannot have one person running static time/weather, playing someone with dynamic time/weather, as there will be competitive advantages and disadvantages. They also have to keep framerates identical, as low framerate can also be a competitive disadvantage.