I've built many different tube amplifiers over the years (my designs and clones). I have owned most of the well-known amps as well. I cannot tell the difference between the real amps and the profiles. The profiling is so good that it does not need improvement IMO. I am not aware of any compelling reasons to change the profile quality.
The Kemper has A LOT of functionality and requires that the user learn how to use and configure it. This can be relatively easy or more difficult depending on the user. It took some time (a few months) for me to learn how it is designed and how to best use it for my purposes. It is not plug and play as far as I am concerned. Not at all like the majority of tube amps that you simply plug into and turn a couple knobs before you are off and running. There are many configuration options and most are buried in digital menus. Rig Manager helps visualize the great majority of these parameters and was a big benefit to me. RM is the best place to start understanding what is possible. I also have quite a few cabs and a high-end PA in my house so monitoring was not part of the learning curve for me, but it may be for you.
I had moments where I thought that I may have made a bad purchase mostly because I didn't like how much time I needed to invest to gain a firm understanding of the unit. Only after spending the time to learn did I realize how good the Kemper really is.
Also, I believe a midi foot controller is mandatory for live performance with the Kemper, which requires an additional purchase For me the controller is necessary because I need/want to use much of what is offered and running the Kemper from the front panel is not realistic for me in practice. Learning about midi could be an additional learning curve for some.
I would stick with it.