just my opinion as a casual 1300 in coustom who is underperfoming in air all the time
stealth on asf is indeed a nice gimmick but in the end it boils down to who got more asf and makes better micro i think. Also regulary scouting is mandatory all the time. but i understand your feelings about this.
in the beginning i always thought, why i should pick anything else than cybran? hives, stealth, telemazer, corsair, mantis, etc..., remembers me of those noob gaps where everybody picks cybran. but honestly after 2 k matches i had my "omg this is op" phase with every faction and still got the feeling i really dont know that much about how to exploit which faction strength when and where. and this is why im happy that pro players with years of xp and multiple k of matches making the balance.