So Sick of "Not" Destroying the Turrets/Inhibitors

I swear it's every single game now, I have to sit there and calculate exactly when to hit a turret because minions are going to take it and I won't get my turret gold.

Even when the damn turret's final hit by a minion, it doesn't even show an assist. You're telling me that I didn't get the gold for the turret or inhib just because I didn't get the final hit? So if someone's about to come and I need to leave and let the minions get it, I'm missing out on gold and a higher grade because of that?

What about denying cs? Letting the turret kill as many minions before they finish it....

Regardless, as a splitpusher averaging 3-4 turrets and 1-2 inhibs per good game, I'm missing out on a lot of gold and possibly an S grade.

Plz fix.