if performance reviews are worthless why do people have them at all? if they are regularly practiced at a company, this means the company puts enough faith in

if performance reviews are worthless why do people have them at all? if they are regularly practiced at a company, this means the company puts enough faith in them to overall promote those who deserve it and to decide peoples' and company's fate based on that. Which then makes it quite a decent interview outcome metric. If on the other hand performance reviews are as bad and worthless as you claim, they should be stopped completely, and everyone running them should be instantly fired as a bunch of ageist favoritist pigs who are scamming the company.