The main problem is that random writes tend to be smaller than the NAND flash erase block size, which is in the range of several MB.
You can check literally any SSD benchmark that tests both random and sequential IO. They're both vastly better than a mechanical hard drive, but sequential IO is still faster than random IO.
You can check literally any SSD benchmark that tests both random and sequential IO. They're both vastly better than a mechanical hard drive, but sequential IO is still faster than random IO.