Adjusting to user done right:
The adaptive brightnes on some Samsung galaxy phones is very good. I didn't realise til I read up in it that it takes notice of your manual adjustments in various lighting conditions and attempts to replicate them; I merely noticed I wasn't manually adjusting brightness as much as I had on my previous phones. It's not perfect, but it's better than what has gone before.
Now, if only Samsung would allow me to remap that Bixby button to something useful like Flashlight, or Pause audio stream.