I get 5 hours battery life on my dual Xeon laptop under Linux. I will say, I miss 2016-era power controls for Linux. Being able to set a max MHz allowed me to

I get 5 hours battery life on my dual Xeon laptop under Linux. I will say, I miss 2016-era power controls for Linux. Being able to set a max MHz allowed me to truly control my power and battery usage. Any idea why Linux changed that functionality in future power governers?