Milder winters could be good. Snow is nice but gets old very fast. No more plowing, smaller heating bills...
Droughts are going to become worse in the west because of warm Winters.
Snowmelt, when the weather warms gradually, will slowly melt. It will seep into cracks and replenish underground water sources. It will also slowly replenish rivers often into (and sometimes throughout) the Summer.
So, a gradual snowmelt helps with the water cycle.[1] If warm weather comes fast, then the benefits over rain are diminished. Then less desirable effects like flooding can happen.
[1]https://www.usgs.gov/special-topics/water-science-school/sci...