Aside from trinkets which do have a role on warding,
I used to play mid by giving my jungler an early ward to stop invades.
I just can't get good enough, let alone acceptable ward coverage early with a high cooldown on Yellow trinkets.
Is basically a junglers only option so far to engage on some heavy warding.. Unless you're lee sin because you're mostly gonna ward hop like a damn frog on drugs.
Supports do have a nice option of warding and their ability to spare sweepers so early but what really gets me is why riot nerfed
by giving it only 3 wards whole instead of 4.
ADC's(Bot lane marksmen), Top and Mid lane in my eyes have the least diverse options of warding so far. Hit level 9 and get a blue trinket because some (Many) champs don't have the luxury of getting themselves a sightstone as it delays their build by a lot.
And squishies don't want to get close to an unwarded bush.
I see wards getting the most silent bashing.
Just my thoughts.