The stock KPA profiles take an incredible amount of tweaking to sound OK....they come very dark and bassy with little clarity.
TBH, I find weird such a statement can be made. Nothing personal of course!
There are too many factors to the final sound, including individual taste, personal technique, the instrument/PUs, and the loudspeakers.
I almost always use HBs, and I neved had the impression stock profiles were bassy or muddy on a whole On the contrary, I find some of them quite thin and piercing. Of course there are some which sound bassy and muddy with my gear and for my tastes.
As a side note, I have no interest in rigs which don't require tweaking: they are amps, not simple presets. Whenever I plug my guitar in an amp I always tweak it to fit my taste, instrument and needs.
I'm also well aware that a rig which sounds bad by itself can be perfect for a certain mix, and the other way round.
In general, we should keep in mind that each profile sounded good to the author's ear for the applocation/used gear.