Hi,
Yours is a good feedback. While I can pass it over for future implementation consideration, currently, I comment PXE boot through an onboard NIC port is still recommended as alternative way of installing an Operating System.
Should you wonder, you can find the Intel® Remote Management Module 4 (Intel® RMM4) and Integrated BMC user guide here: Server Products — Intel® Remote Management Module 4 (Intel® RMM4) and Integrated BMC user guide