I have used them in residential settings for HT and 2 channel customers. I don't find them harsh at all unless it is in the recording. They are accurate and detailed. They don't have peaks and dips like many consumer speakers making them more bright, warm or whatever other description people use.

Room treatments are important no matter what speakers you are using but they are not typically used to change frequency response and more to control reflections except bass traps. You will not see a big change in measurements with acoustic treatments using sweeps except for frequencies below the Schroeder frequency.
There are other factors like high frequencies lose energy quicker so you will see a drop in high frequencies the further you sit.

Room mode problems below the Schroeder frequency will show in measurements and need to be corrected no matter what the speakers.