[Matrixbeast]

Well, the reason why Hail won't really get it's time to shine are 2 main reasons:
It doesn't have a significant secondary effect/use. Sunlight and rain half the damage of their opposite attacks and gives benefits to grass and electric, respectively, while Sandstorm gives a nice SpD buff to rock/steel/ground, as well as damaging each turn. Hail just kind of deals damage. 100% accurate Blizzard is nice, but it's just not a big enough bonus.

The other problem is that Ice type sucks. Regardless of what type you are, if you're half Ice, you will always gain more weaknesses than resistances because Ice, in a move of brilliance, only resists Ice and is weak to 3 common types and one type that is gaining a little more traction because of Fairies...

I think they need to either give Hail the SpD (Or Def) boost Sandstorm gives to Rock/Steel/Ground, or just buff Ice to give it a couple more resistances so it's a more beneficial type to have.