Turrets need fixing, not buffing
It's been said a few times. Current meta right now on here is to complain about how turrets don't do enough damage. The turrets do enough damage IMO, if anything it's the targeting that needs fixing. Turrets are sometimes painfully slow at targeting enemy champions when minion pressure is applied on the turret, and that's why people complain that their enemies escape with a good portion of their HP, because the turret doesn't aggro till maybe 1 or even 2 seconds under tower while you get mauled away at because the turret target switching system is slow.
Turrets aren't meant to do high damage all through the game so that you don't always need minion pressure to take a turret down. They're meant to make it harder (not impossible) for enemies to kill you, with or without a gank. If turrets switched targets quicker, adding more damage to the turret wouldn't be a problem.