The Primary parition limitation

I know that we cannot create more than 4 primary partitions. But, why. When technology has grown in leaps and bounds, why this "limitation"? I got the answer to this from ilugc. Any Hard disk drive contains a 448-byte Boot Loader Code (Initial Program Load Code - IPL) followed by a 64-byte partition table. These make up the first 512 bytes of the first track of any HDD. Any OS installation starts from the second track only. Each partition table entry needs 16 byte, thus limitting the total number of partitions to 4.