Very accurate. 2 point, 4 point, etc is a function of the cutter. Flexi supports what a cutter supports for the most part. Our Summa will have a row of registration marks about every inch along the left and right, it detects as many as it thinks it will need but usually will detect every foot an a half or so. It might use 10 points, it might only use 4....
On some other brand cutter. I cannot say. Summa's are very often regarded as some of the most accurate cutters made but they are still not always perfect every time.