Watching Instagram reels or any similar social media video is a terrible way to test the screen/video playback quality of a phone. These videos have often been screenrecorded from another app or source and in general have been compressed to hell and back and retain very little detail compared to what they should have had. Instead you find some high res videos on YouTube and watch those, especially anything HDR; turn up your screen brightness and turn off the lights and you’ll get a much better indication

The base s23 doesn’t have UWB but it’s a fairly niche thing so OP probably won’t miss it