Kexts Installing Necessary?

I just installed el capitan on my thinkpad x220 following this guide http://x220.mcdonnelltech.com/os-x-el-capitan-installation/. After booting everything seems to be working fine so do i still need to install the kexts with kext utility? When i did it on mojave before it broke my brightness controls so will my machine be fine without?

submitted by /u/NO_obslayer
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