Evasion weather abilities

Even though abilities like sand veil or snow cloak are useless by themselves, combined with the corresponding weather is like giving pokemon a 20% evasion boost (1/5 moves miss) .

Evasion , ohko sets are banned from smogon ,due to emphasizing on randomness and pure luck (swagger as well) . So my point is to ban the use of those abilities with pokemon that provoke the

right weather and also ban quick claw as it can just be weird/unfair/fully random at times (slow pokemon going 1st 1/5 of the time). Keep in mind that those moves/abilities/items can be very game changing and can revert the tide of the game with a simple throw of a dice.

Its obvious that those ideas arent used in high competitive levels due to being so random, but the abilities cost literally nothing and give an unfair boost(im talking to you sdance chomp :D ).