@GoanGeek In terms of battery life maybe a slight reduction but certainly nothing major and I use WQHD a lot,though not at all times. Mind you I only use Dark Mode sparingly and game little on the device.
The only significant bug was that recently music (mostly streaming services)would randomly stop on ocassions,clearing the cache partition seems to have sorted this out.
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .