PSA for mid/top laners and junglers in team select.
One of you picking a tank or off tank with high CC helps the team immensely. The support is constantly money starved and cannot effectively tank unless the game lasts an hour and the support gets full build. The ADC is obviously forced to go AD glass cannon.
Please stop complaining that I don't pick Thresh or some other tank vs Morgana or another counter. I'm sorry that we won't have my MASSIVE 80 Armor to tank for the team with my medallion, sightstone, and boots.
If top and mid are glass tank AD assassins, please go AP or tank jg. If we have Master Yi jg please take a mage or tank to mid/top. Support cannot make up for weak spots in the team except with sheer CC. Last pick is so often left with only support open, and this is a problem when the rest of the team is bad at making a good team composition.
tl;dr It is not the supports job to tie up loose ends, although we try our absolute best. Learn multiple types (Marksman, Mage, Fighter, Tank, even Support top/mid) for every role except ADC which is obviously locked into marksman.