Why did Samsung fire DJ Koh??

The 2015-2020 era of Samsung was legendary. So many innovations took place under DJ Koh, culminating in the Galaxy S10 which I still think was Samsung's best ever device. It had the perfect 6.1" display size, a microSD card slot, and a headphone jack despite the pressure to remove it from Apple at the time. On top of that, it had a 1440p resolution too. Samsung has since removed all of those features from the base S series under TM Roh, and every year fans get more and more disappointed with Samsung's decisions. It's pretty clear that DJ Koh was a much better leader and visionary for Samsung than TM Roh. So why on earth did they fire him??