Why is brd.c built into the kernel

Issue

• When the brd driver is built in to the kernel there is no way to change the number or size of the ramdisks without rebooting the system which is inconvenient.
• If it were built as a module then the rd_nr and rd_size module options could be used to adjust the ramdisks as needed.
• Redhat usually builds everything they can as modules so why the exception for the brd driver?
• Fedora builds it as a module and there does not seem to be anything in the boot process which depends on it.