Don't expect your support to be able to ward anything with 3 wards if half the enemy team can detect

The number of ways to destroy wards is super high if you let your supp do the vast majority of the warding. Sweeper can clear entire swaths of the map or more if they have someone else doing the ward killing, not including champs that can speed boost to cover more ground. Not to mention vision wards and . Adding on to that if nobody is gonna escort the supp to ward ojb when there's barely any map coverage, don't expect anything to get warded. If you wouldn't feel safe walking to a pit alone, without vision your support isn't safe doing it.

Also feel free to check out vision score stuff at the end of the game. Vision is game changing.