Probably mostly personal taste. I use many different guitars, many profiles in styles from dead clean to medium high gain. Can't say three dimensionality has ever come to mind.
Do you tweak profiles or just try them as they are? My thinking is tweak it to what you want. Would you get any new amp, plug it in with no settings and expect it to sounds great? Yes, with tens of thousands of Kemper profiles you can always just look for more. But you can also just change cabs, play with gain and EQ and the great options under Amplifier.
I've had my Kemper for many years and I try out profiles all the time. But I generally stick to a set that I've customized to be all that I want them to be. I don't find them lacking in any way.