I definitely use Kelvin when shooting ballroom dancing under incandescent lighting. No I don't shoot raw, as these pictures are often used on a web site or for scrap book archives of the dance organization. I have no interest in the added complication in workflow of shooting raw. Ballrooms often have fancy chandeliers with dozens of tiny bulbs, and a setting of something around 3200 K works very well. The skin tones are warm and pleasant, but not annoyingly yellow or approaching orange if AWB is used.
I may get flamed for shooting JPG, but my output with a 70-200mm f/2.8 II and a 6D fulfill the needs of the Colorado dance organization. Compared to everyone else's results with their compact cameras, the dances I shoot using Kelvin turn out excellent.
I might suggest that successfully shooting JPG for paying clients shows a degree of professionalism.. you can get it close enough in-camera, just like we all had to do with film.
Professionals I know tend to use the best tools available. But real men don't eat quiche, right?
Please remember, when talking about film, y'all had that plastic strip...I think it was a negative? Didn't it have quite a bit of leeway for working with prints? Dodgin' and burnin' and all that? JPGs limit what can be done with images, digital and print. RAWs are the soft generation's negatives, I guess.
A hallmark of professionalism is use of appropriate tools, they need not be the best. If for example a client prioritizes quick-turnaround, adding steps post-capture is inappropriate.
Then we are kind of getting mixed up. If comparing to film days, there was one hour photo, or polaroid...
You are right, JPG has an important place in a few situations these days, and, getting it right consistently for JPG shows great camera skill. And that's where proper color temps are critical.
But lower quality images, even snapshots, have long been acceptable for "night on the town" work, direct flash and all. And I understand that photojournalism standards lean towards JPG. Like everything in photography, trade-offs, so, for less flexibility and lower standards generally when speed or hoped for integrity is the priority, JPG.