SkiBum.All super valid points. All of which I have thought of as well. You can die anywhere, tree well, fall hit a rock, get hit by a car at the trail head.
I bring probe/beacon/shovel solo in case i meet up with someone. Which happens a lot, no doubt there. I don't have many friends, hard to find people so ski with that are at my level (which is not lets go get crazy, lets go ski mellow pow and have fun. Save the crazy stuff for spring).
Wasatch is in my back yard, and its a zoo. So you always see or find someone if you go up there. Keep the gear in case you need it elsewhere, like you said, someone else somewhere else. Or you meet up with someone.
I won't argue solo stuff is not the best, but I usually trust myself better then anyone else. Again, not the best way to go about it, but I know my risks and rewards and its always in my head.
Hell, I used to bring my sled out into Uintas alone. I used to bring enough gear where I could live a few days if needed. Again, not smart, but its what I do.
To piggyback on that, 5 reasons I advocate a few solo bc days a year-
1) You get random time off work and no one else can ride at the time.
2) You can bump into different crews and make new friends.
3) You can set a mellow place to explore a new zone. Feel out the snow the entire time, make a pit every 10min... with no group pressure of riding more. (At least for me, with a group I like to rally more, but maybe that's a group mentality I should improve on)
4) Similar to 3, you can experiment with different skinning techniques, practice z turns, learn maps, improve skin-ski transitions, play with GPS.... An odds and ends day that is more backcountry experience than skiing. I think this is better alone since solo terrain choices are far more conservative. It's prep for a real day with friends that's GAME ON.
5) You develop the best backcountry mentality. There is no safety net. It's reminiscent of a Drew Tabke interview in which he supports skiing with no rescue gear (beacon, probe, shovel) because that encourages safer decision making. I don't share that opinion (and still have rescue gear when out alone), but I will say I have improved my backcountry safety protocols so much from my days alone.
Am I near a terrain trap?
Hmmm is that roll over 34-degrees?
If someone drops from above is this a safe place to be?
Have I read the map correctly that this is a safe line?
Hmm, is the roll over a good idea?
Do my observations match the forecast?
What was the forecast?
Am I doing the correct tests for the forecast?
This shouldn't slide, but if it does, where are my islands of safety? What should I do?
Can I find a test slope?
Is this an appropriate test slope?
Should I just turn around and go home?
Is it safe enough at all?
How do I safely turn back?
These questions carry so much more weight being alone. It's a great time to build confidence and learn your risk profile.
****Note: When alone I ski non-slide terrain, or spring conditions and even then ski it early and conservative.
I have also taken an avy 1 and have ski with several wonderful backcountry mentors the rest of the time, so I have a basis of skills to work with. And I'm taking an avy 2 recreation this winter
Alone without prior knowledge and experience is a darwin award