Like you I'm still rocking my S21 Ultra. I didn't upgrade to the S22 because like you said above it wasn't much of an upgrade. Reports of poor battery life and network issues also put me off! I wanted to switch to a Google pixel but both the pixel 6 and 7 use a Samsung modem, and reports of poor network signal or loss of signal are rife and so held off. Because the S23 Ultra won't have the crappy Exynos chip, I'm probably going to give it a go but that depends on the price.
@GoanGeek Would hope that you can still use a Samsung Device and stick around 😁 I have had any significant issues with One UI 5.0 on the S21 Ultra, will need to see how the S23U shapes up.
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 .