From my perspective there are tradeoffs (obviously). I was using Koflach Verticals and they worked really well for the ascent. They also worked well traversing and even mild to moderate descent on corn or manageable snow.
Where they failed for me was descending steep, icy and other types of skiing where the ankle stability of a ski boot is critical. I tried early on to compensate by over-tightening the laces prior to skiing down, but it was never enough; I always felt like I could easily bust my ankle or knee with one wrong turn.
I switched to Garmont Mega Rides. I had skied other Rando boots, but always drifted back to these, so I finally bought a pair. They're great boots...and light too. The only drawback for me has been getting the perfect dailed in fit. For skiing, they're perfect. But I keep getting some shin-bang when I'm climbing, even after the second fit. Not super bad though. I don't blame the fitter or the boot, I think it just may be me.