What is the purpose of firmwares in rootfs.img (included in install.img) ?

[viance]

I'm trying to create a custom RHEL installer ISO that is based on rhel-8.10-x86_64-boot.iso and uses kikstart for the automatic installation process. I noticed that install.img contains /usr/lib/firmware which takes up a lot of space.

What is the purpose of the /usr/lib/firmware in install.img if ISO installer will be include a linux-firmware RPM package in BaseOS (e.g. linux-firmware-20230824-119.git0e048b06.el8_9.noarch.rpm)?

Note: I installed such an ISO with a recreated install.img without anything in /usr/lib/firmware, and there were no problems during installation and operation on a some virtual machine and a hardware server (HP). I want to be sure that this won't cause any problems in other cases.