Great discussion.
I love hard-booting, but I prefer the feeling of soft boot carving. It begets the flow, fluidity, and body English that, for me (and perhaps not you) gets to the heart of what's beautiful about snowboarding.
Think: Craig Kelly. I was lucky, early in life, to take a few groomer runs with Craig at Snowmass. Seeing him ride in person burned into my brain a peak potential of soft boot carving, or, for that matter, any carving: very, very fast, always on rail, pencil-thin lines, very large radius turns, and very controlled but with very pronounced use of hips, a rear driving/rudder arm, and fore-aft weight throws accelerating out of turns and off of terrain. And then he'd flip around and do it fakie--at the same speed.
Craig's soft boot carving blew me away at a time, in 1990 I think it was, when we were first pioneering 55 degree stance angle and hip-dragging heel turns on steep groom--pioneering in the sense that, back then, before the days of youtube or social media, we were making turns that we'd never seen others make. It was a revolutionary and exhilarating time. Yet, even amidst that, Craig's carving was clearly supreme.
His aesthetic of grace at speed deeply influenced my own riding. It drew me, after my racing stint, quickly back to soft boots. I sought out long boards--like the 195 Glissade big guns--that afforded deep, damp stability railing long radius turns at high speeds.
At the heart of that transition from hard back to soft boots were heel turns and the issues of shoulder squaring, hip rotation, stance angles, boot-out and lost lateral leverage. For me, a front foot at 35-40 degrees and a forward-driving back knee, helped by heel lift and/or canting, affords hip rotation I need for a heel turn to feel right. The resultant forward pressure requires boards with enough forward profile and stiffness to not fold. Extra stiff boots--especially on my front foot--Talons--help with lateral leverage. Extra wide carving boards at long last resolve boot-out.
Admittedly, when I do break out the hard boots--and it's rare these days--I'm guilty of still riding 90s-era race board prototypes. They rip, but are also lively to the point of being rude and rambunctious--too much so for a guy nearing 50. I like to think they showcase a rider's rustiness. Many posts on these forums mention the advances in GS alpine board technology--grippier, quieter, more stable and easier to ride. I'm eager to try one. It may well draw me back into more hard booting days.