For the point about the Google firmware modules, the firmware directory you linked to is specifically for Chromebooks, which people do have, and the modules are

For the point about the Google firmware modules, the firmware directory you linked to is specifically for Chromebooks, which people do have, and the modules are useful if you want to run vanilla Linux with coreboot on this hardware. If the code for these modules was maintained out of tree it would be much harder to run a regular Linux distribution on the hardware as you'd have to go build a custom kernel rather than just reconfiguring and rebuilding the kernel your distro provides. Furthermore the whole point of modules on Linux is that you can completely disable them, or if they're built as modules they'll only be loaded if needed (in some cases this is done on-demand automatically if the relevant hardware is detected, in other cases it might be done via logic in your initrd).