1-For recording, it's very rare that anyone needs to record the wet signal and that's when reverb matters most, hence current reverbs in Kemper aren't crucial.
2-For Live use the venue or room will influence the reverb regardless what you use. IMHO it's unrealistic or practical to demand the utmost highest quality reverbs for live use. It just isn't done and thousands over thousands of guitarist got that taken care of using old spring reverbs or any of the digital reverbs that are in abundance anywhere you look , including inside the KPA.
The Kemper reverbs are more than adequate for live use and that doesn't imply that there are any sacrifices involved.
I wouldn't mind to get more variety in reverbs but this is by no stretch a do or die situation.