I do not think that Ram Plus is necessarily needed for high end Devices, it depends if you are likely to be close to the limits- best to monitor. However if you do not have One UI 5.0 Ram Plus can only be turned off via an ADB command.
some testing has found RAM Plus reduced performances on certain devices,however there may be different experiences. https://www.androidpolice.com/samsung-ram-plus-phone-how-to-disable/
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 .