I played lol since the beta, that's 7 years. Just putting it out there.
And with that in mind, i don't think i'm any more qualified than you to debate this question.
The point was the turrets were buffed. Whether this wasn't enough will require time to see clearly, as Riot never wants to make last minute changes to the game that can have an impact in prolonging the game substantially.
We both remember the Marksmen update, where the average game time was reduced by a few minutes. That was a huge deal but Riot was making the changes in that direction.
Now imagine if they didn't do their homework and overbuffed turrets so that the average game time goes up about 10+ minutes. That would've completely screwed things up and the games would feel very different because everything would've been delayed for an additional 10 minutes.
I'm completely OK with them not buffing something enough and then buffing it gradually until it's fair because this way, you will always have better experience than before, as opposed to overbuffing them and feeling like you can never finish a game if 5 people are not whaling on a turret to do any meaningful damage.
Just my opinion.