Which is dumb, that's not how snowfall or accumulations work.
Snowgrowth and cloud processes are extremely important as is the degree of lift into the snowgrowth zone, wind, type of snowflakes (well that goes with snowgrowth) and thermal profile. These factor greatly into the snowfall ratio which also isn't a constant throughout the storm, the snowfall ratio is going to vary and sometimes greatly.
You can't just assume ptype and multiply by 10 and none of these fancy algorithms factor in what's most important.