The reason for all these unnecessary turns at modern tracks is that F1 cars are limited to ~190 miles in race distance.
The modern day Fuji was designed to get F1 cars there. In order to get F1 cars there, they had to built a bunch of unnecessary, twisty, and slow corners at the end to make the lap time slower, or else the race would be over way too fast.
That is the ultimate problem with the new tracks. By making F1 a specific race distance for every track in order to make the race last about 1 hour 30 min (except Monaco), all the tracks are carbon copies of each other. This leads to unnecessary corners that have no flow to the track.
The solution to this is to take the 1 hour 30 min race window and apply that standard to each track to see how many laps each race should be. Some races would end up being a little longer than 190 miles then, but you could then design tracks that have a nice flow to them.
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