Don't know if it's just m21 problem.

Google apps have material you theming in dark mode but most Samsung apps just have plain black background.Hope Samsung improves this in future

Honestly, I expected Android 12 to just slow the device down. But so far the experience is completely opposite. Scrolling on all apps is smoother than before. And the animations are slick as well. Also, so far no bugs. Good job, Samsung!!

I was so frustrated before with the heating issue. It was while using the smartphone, charging the smartphone. Finally a relief.