^^^ It is surprising that you think the bowlers are not capable of taking wickets without the usage of saliva. Only a minority of the bowlers use saliva or any other substance to get swing. There are a lot of good bowlers who can swing the ball naturally, just using the ground conditions. Usage of saliva puts these bowlers at a severe disadvantage.
There are different factors that aide the swing, why do you think it is impossible to swing the ball in subcontinent conditions until the ball gets old, when you take a global approach a minority is playing cricket but anyone who plays cricket with a leather ball they use saliva to shine to ball.
Hope you are aware that you are not able to use any other objects to clean the ball other than saliva and it is not a new phenomena and if you ban the use the bowlers will be at an disadvantage.
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PS : Never put "shining the ball" and "tempering the ball" at the same bracket as both are different things, Ball tempering happens when players disturbs rough part of the ball (Warner-Smith saga) or intentionally remove the seam(rare)
It is a good demonstration on how swing works, i do not understand why they have no idea about swing and what is the importance of shining one part of the ball.
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This is where I always get in to fight with you. Nowhere in the laws of cricket, it is written that saliva is permissible. As per the laws, all forms of ball tampering is illegal. Now the laws are being interpreted in a way, to make saliva legal and other substances such as vaseline and sandpaper illegal. Let the ICC update this contentious rule. Let them specify that saliva is permitted and other substances are not.
Anyway the ICC makes new rules and update the old ones every now and then.
Hope you understand that the use of saliva is banned because of the Corona situation. The history of using saliva will be as long as they started playing cricket.