tall pumice
there are a variety of reasons, here are a few:
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requires precise steering - some corners are right up against walls, and if you steer into them too much you just crash and your race is over
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back-to-back high speed corners - if you mess up your entry into these corners and don't turn at precisely the right time, you'll end up going wide—you have to have perfect timing to use all of the track
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change in elevation - some corners can have uphill or downhill zones which shift the balance of the car. This means you need to adapt your acceleration/braking to the change in balance, or you'll end up locking up or spinning out
It's worth mentioning F1 cars don't have ABS, so you can't slam on the brakes and turn the car, you'll end up going in a straight line when your tires lock up like Hamilton in Baku. They also don't have traction control, so if you're too aggressive on the throttle/steering, you'll lose grip and spin out. This means the drivers have to be really confident in their inputs to drive as quick as they do, and any new variables make that a lot tougher