Yeah. Like you would think you could just look at reflectivity data to determine whether or not it's currently raining, but at most places you are far from a radar site and even the 0.5 degree tilt is scanning a mile above your head. There might be rain there, but is it reaching the ground? All you can really do is guess.

If you're interested in providing on-the-ground condition reports, install mPING: https://mping.nssl.noaa.gov/

I keep this app on my homescreen and try to report when very light rain starts, since it's not always obvious from the reflectivity data. Ultimately the user reports get fed into things like improving the model, and more data is always good.