Obviously the big issue is melt/compaction with the once a day measurement.
If you aren't checking for the max depth, you are likely to miss it. If you work from home it's easier to check frequently. But say it snows in the morning, you head to work, it stops at lunchtime, you come home, sleep, get up and measure at 7 AM the next day and the whole time temps were around freezing. You could "lose" a bunch of snow in that case.
This is why our spotter training focuses mainly on snow (sorry @weatherwiz)