#3 No use of saliva on the ball
Reverse swing has been a massive part of the game over the years. When the new ball is new, the pacers extract traditional swing. But as the ball gets older, the swing stops which makes batting easy. So, the fielding side invests a lot of effort in shining one side of the ball so that the fast bowlers can pose trouble to the batsmen with reverse swing.
The fielders apply saliva and sweat on the ball and then shine it that aids reverse swing. However, applying saliva goes out of the window now. In ODI cricket, with the introduction of new balls at either end has made things easier for batsmen. One ball becomes only 25 overs old at the end. If saliva can’t be applied, it just leaves the ODIs with hardly any reverse swing.
In Test cricket, the red ball lasts for at least 80 overs. We generally see reverse swing after 50 overs. But now with no saliva, it could be delayed even further. A lot of cricket pundits have advocated the use of calculated ball-tampering so that the bowlers stay relevant in the game. Otherwise, the batsmen would continue to enjoy the rules which are already more in favor of them.