I live in the mountains - the Sierra Nevada in California. Surprisingly, one of the hardest pieces of weather information to obtain is the predicted snow level for upcoming winter storms. The NWS sometimes mentions this in a Winter Storm Watch or Warning, or their Forecast Discussion, but not always, and the information they give is rudimentary.
Windy has the option to show the freezing level, which is great, but it shows the freezing level for the altitude above the land, not the altitude above sea level. Showing the altitude above the land might work if the forecast models had, maybe, less than 1km resolution, but they don't. They average the elevation for a large area, so in the mountains it's very hard to determine what the freezing level above sea level, or the land, actually is.
In the Airgram I can see temperatures related to air pressure, and I can make the conversion to convert this to altitude, but that's a bit painstaking. It would be so much easier if we could just see the freezing level in elevation above sea level. We mountain dwellers would really appreciate that feature!