Since it is a "cheaper" device and they put the 3.5mm jack, I would have also preferred a rear dedicated capacitive fingerprint scanner which is way faster and direct compared to an under-display fingerprint sensor. And a notification LED and the iris scanner.
What about the proximity sensor? Starting in Galaxy S10, Samsung replaced the IR hardware proximity sensor with a "virtual proxmity sensor" based on software and it gave a LOT OF PROBLEMS to people like phone turning on in the pocket, accidentally dialing people or starting apps, Always on Display remaining on in pocket and wasting battery etc. Or often the "virtual" proximity sensor didn't work with other calling apps like WhatsApp. When used with headset with mic in the pocket, it still kept the display on and many such issues. The hardware proximity sensor was free from such issues. (Apparently, Xiaomi, Redmi, OnePlus, Realme also copied Samsung and ditched the hardware IR sensor).
That's when I was done with Samsung. Sadly it doesn't like all the good things which they removed when ditching the bezels - LED notification and hardware proximity sensor are coming back. And anything was better than the slow under-display fingerprint which first requires you to turn on the screen, and still isn't as fast and instant as the one on the front in the Home button (in old phones) or the rear FP sensor.
Their forums are all about proximity sensor issues:
https://us.community.samsung.com/t5/Galaxy-S10/Proximity-sensor-issues-S10-S10/td-p/498492
https://eu.community.samsung.com/t5/Galaxy-S10e-S10-S10-S10-5G/S10-Plus-Unlocking-and-Waking-In-Pocket-Pocket-Dialling/td-p/1019733
https://www.youtube.com/watch?v=OM4Tt8QoEfQ
https://www.google.com/search?q=Samsung+pocket+dials+911
https://eu.community.samsung.com/t5/Galaxy-S10e-S10-S10-S10-5G/Always-on-display-pocket-mode/td-p/1171606
https://us.community.samsung.com/t5/Galaxy-S10/Proximity-sensor-issues-S10-S10/td-p/498492
https://piunikaweb.com/2019/03/18/samsung-galaxy-s10-proximity-sensor-acts-glitchy-during-calls-users-say/
https://piunikaweb.com/2019/06/13/oneplus-7-pro-proximity-sensor-demystified-how-it-works-or-gets-buggy/
https://forum.xda-developers.com/oneplus-7-pro/help/proximity-sensor-issue-op7p-t3937147
https://www.reddit.com/r/Xiaomi/comments/dzyirs/ultrasonic_proximity_sensor_not_working_on_xiaomi/
https://forum.xda-developers.com/Mi-9/help/pocket-mode-t3940910
https://forum.xda-developers.com/oneplus-7t/help/pocket-mode-available-t3999477