The whole point of the Kemper Kabinet to get the “amp in the room” sound, which has traditionally been missing from modellers and their mic’ed sound.
I run my Kemper into a real cabinet at home, and I indeed think that's an amp in the room sound! Especially if you use a DI profile. But really, even with a merged profile and cabinet section off, it does sound like the real deal.
The trade off is that with different profiles, the Kemper tones don't come through a lot of the time.
When I play my Kemper through monitors, on the other hand, it sounds like a recorded guitar tone with a cabinet miced up.
As a lot of users have experienced however, that makes for an anaemic experience on stage when it comes to monitoring, at least when compared to a real cabinet.
In that sense, I think the Kemper Kabinet is more of an attempt to give guitarists an FRFR speaker that is designed for guitar (and bass). Kind of like a bridge between two worlds.
The speaker imprints, in that regard, are probably designed to make the Kabinet Kone function just like the speaker it is trying to model. So sort of like running through a V30, or a Greenback, or a Scumback or whatever.