Its the same point, the both can ruin you with the RNG, and no one team have all covered, like ex:Togekiss scarf can fuck you up with air slash who can flinch in every attack, you also can lose because a miss against Garchomp, You have various options of dealing with a Togekiss Garchomp in sand storm, You can choose to run something that deals with Garchomp: Ice moves/Dragon moves/priority moves/focus sash/always hit moves/status/weather/counters.
If we gonna start to ban things only because a bad match up or because a RNG turn can make us lose we gonna need start to ban various pokemon.