In the beginning, Bootcamp had a real job.

It allowed a machine running Intel's EFI firmware (as Intel Macs have always done) to boot an OS that only understood the older BIOS standard.

Once Microsoft and the various PC vendors started supporting UEFI directly, Bootcamp was just a bundle of existing Windows drivers from the component vendors.

If you put a specific Broadcom Wi-Fi chip in the Mac, Bootcamp included Broadcom's Windows driver that was best suited for that chip.