Im not entirely sure if the meta of "You filthy support, do all the warding" is good. I think everyone should consider wards, there is no reason not to. If youre going to make a case for how important is for X, Y, Z to be done with wards/sweeping lenses, then it can only be done better if everyone shares the responsibility. When I go mid I buy a pink for my back right jungle bush near the raptors, and a stealth on my first back to ward the opposite side of my free ward. Denying the jungler easy ganks on me more than makes up for the cost. At level 9 you can bet Im spending 250 gold on better wards and keeping 100% up time on both river bushes. Similar when I top, pink on my bush between inner and outer turrets, stealth in river, free ward in one of the bushes, which ever they will try to escape too the most.
Iv seen games that have gone decidedly in our favor get stagnated by enemy turtling, and to counter this we start split pushing. This lets them catch up in farm and take out a split pusher or two, or catch the jungler invading. This starts to melt down our snowball and lets them find a way back into the game. This "way back into the game" could be easily curbed by people spending the 250 gold on upgrading the free trinket so you can see the gank coming.
Iv finished countless games where no one else has upgraded their free ward, and they've even announced "full build." Also when your getting pushed back that is the time to buy wards and ward up the bushes and jungle. Often we have been able to escape the base and kill ADCs and Junglers invading our jungle cause they though we were stuck in our base and didnt know where they were.
Look at it this way, if you spend 250 gold on a ward/trinket upgrade, and you avoid 1 gank cause of it, then you denied them the 300-500 gold bounty on you, not to mention NOT losing out on the farm you cant get while dead.
Warding is everyone's responsibility, the only reason the current meta even works is because others are abiding by it. If every player had upgraded wards at 9, and had decent placement, then they would have a decided advantage due to the vision they would gain. Im tired of begging people to buy wards just so we can avoid their fed jungler, warding well in the first place would potentially stopped them from getting fed in the first place.
So a "supports do this warding scheme" maintain the meta thread isnt really helping in my opinion, its merely an attempt to train people to do something that only works because others agree to do it the same way. Just like old black powder musket days when hundreds of soldiers would line up shoulder to shoulder across from the enemy army and launch volleys of musket fire at each other.... that kind of warfare only worked cause that is what the enemy agreed to do also.
In my opinion, the support should have the stealth wards and the carry should have the sweeping lens, oh no spending some of your precious carry gold to murder that stealth champ.... oh my forbid.... The support can spend time walking around placing wards to protect from ganks while the carry farms. The top and mid ward types could vary depending on their disengage options. The mid almost certainly needs a stealth ward, but picking up a lens to help your jungler gank mid isnt a bad idea either. Warding is complex, and the only reason the OP thinks there is "One way of doing it" is cause there's only one way people generally do it.