As wsp_scott mentioned above, Dave is about as experienced as they come (and has spent tons of nights, mostly solo, in Griz country). I've done a big trip with him (8 day loop of tech canyons and packrafting in the Grand) and I'm not sure I've met anyone as thoughtful when it comes to backcountry travel. He mentions Yellowstone data (in the comments) that it's only once a group has more than three people is it statistically more safe, so not just opinion.
As for skiiing, he's had several posts over the years that go into more detail on backcountry skiing (
here's one), but he's had a couple (extremely experienced) friends die in avalanches and basically takes the stance that beacons/gear/partners/etc give a false sense of safety and if it seems completely insane to go somewhere solo then it's just probably not worth the risk at all with something as unpredictable and deadly as avalanches. I'm too obsessed with canyon country to have much relevant skiing or griz country experience but I'm sure Dave would be happy to discuss if you throw him a comment on his blog.
In all these cases, once you're in trouble it's likely better to have someone with you; the point is to avoid them in the first place an to challenge the assumption that it's a given that traveling solo is somehow more dangerous. There's a ton of widely accepted "conventional wisdom" when it comes to backcountry travel that isn't really based on anything so I feel like it's always a good exercise try to reconsider some assumptions, do some new reading/research/thinking, etc.