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It seems that a consensus on tire wear is that tires should be replaced if you'll be driving on icy roads with less than 6/32" of tread, but are safe on other roads up to 4/32" (source). I'm wondering if the added safety of winter tires means that they are safe on snow for a little longer, say, to 4/32".
If the question seems too opinion-based: do winter tires with 5/32" of tread perform just as well on snow as all-season tires with 5/32" of tread perform on non-snowy roads?
Continental say 5/32" or 4mm- https://www.continental-tires.com/car/tire-knowledge/tire-care-maintenance/tread-depth
Some winter and all-season tyres come with an extra set of wear bars set at 5/32" or 4mm for when they're considered unsafe for snow use but they're probably still good for snow/ice-free roads right down to the normal wear bars. On snow/ice-free roads it's the difference in the rubber compound for all-season and winter tyres that gives you more grip at low temperatures.
As for whether all-season tyres are as good on snow/ice-free roads as winters are on snow, it depends on whether you're still in the optimum temperature range for all-seasons. I suspect that the advantage would come down mostly to the road surface being clear and pretty much any tyre would beat driving on snow.
