I have a question pls help

Someone said that my executes (attacking) dont have info of other sites I wanna know whats the purpose of getting info of other sites, I know that you can attack where there are less number of players/ operator players are not present but I've seen in many matches defenders constantly changing their sites where they think attack is going to happen so I wanna know whats the purpose of getting info of other sites if you stun flash every corner in the site (where you are going to attack) clearing every corner

just rush b 5head