I get that some people are kinda like those who gave their film rolls to the drug store and got back some nice prints. That's like accepting the image from Pentax engineers and how they think it oughta look. Which can be great; after all, most all of use could get some great slides that never needed much of anything (well, except maybe some pushing at developing or the like).
But others of us are more like aspiring Ansel Adamses—getting the negative (now the raw) was just step one; getting the finished print, something you wanna show, requires just as much control, attention and time (if not more). And some of those filters are everything from dodging and burning to compositing. None of this is new; digital just makes it easier.
It gets a bit more complex as you do RAW because you are trying to optimze the RAW, not the JPEG the camera generates when it creates that RAW file. I'm with dcshooter in that I find the Pentax jpegs overdone, but I'm biased, cuz I wanna start with a more neutral view. Even with DNG raw the embedded JPEGs are fixed a bit, and some of those previews look better. But looking at them in the camera you can't tell what you've got; not as bad as with film (a complete mystery), but a proper ETTR exposure may look like crap. I just had a bunch of shots where I stopped down for DOF purposes and the DNG/previews in camera looked black...but were still perfectly good images (and yeah, if I'd had a ND I would have used it, but sometimes you don't).
Bottom line, some of us shoot images where we are always gonna use filter and PP. WB is another good example; I use a target and don't bother until I get home to adjust that. I'd rather have the control I get with desktop software than the camera's interface and computer to do it.
And if you wanna get really in the weeds about how a RAW is always kinda cooked to give you certain types of previews, see these links:
Adobe's Silent Exposure Compensation Forcing a Raw Converter to Render Tones Accurately | RawDigger Deriving Hidden Baseline Exposure Compensation Applied by a Raw Converter | RawDigger
I used the advice there to find the hidden exp compensation in my K-3ii DNGs, but ultimately it wasn't worth messing with that precisely except as an educational exercise. And BTW, try Fast Raw Viewer if you do RAW, it's great. And the tutorials on the web side are really interesting.