I personally as a brimstone main would like for an increase in the range for the smokes if there was to be a buff.
No matter the buffs, i dont see how the other smokers can compete against astra when she can have roles the others cant. The only way for that to happen would be that the other smokers would also be owerpowered in a sense so as to justified picking them over astra. And there you would not only one overpowered character, but more.