Most Tahoe buildings are not A-frames, 500-800" snow years are big years, not average, and also those are resort numbers, not towns where more houses are. Modern buildings in Tahoe are engineered to hold very high snow loads, typically have a lot of snow on the roof, you need to do snow removal as needed.

I live in Mammoth where the town is significantly snowier than say Truckee or lake level Tahoe. The grocery store is open and operating normally no matter how snowy it is. Including the 22/23 winter when 695" fell in town. Lots of buildings did collapse that year though and snow removal was a constant struggle.

But A-frames or other very angled roofs are not typical here, roofs have to handle 300 lbs/sq foot, and there are requirements for where a roof is allowed to shed to. Typically they will angle in one direction to control where shedding happens. Keeping the snow on the roof also provides insulation, in a typical snow year we may do basically no removal and just have a blanket of snow on the roof the whole winter.