For plates to fall off at 14 minutes anyways...

I kind of miss where this helps out those champions who want to safely farm better longer, like you said for the reason why the change was implemented. They still lose tower quickly since they are (can) not pressuring the enemy (because they are not designed to until later in the game). Plus the enemy gained 800 gold from plate breaking. Sure no more towers falling at 5 minutes, but 10 is do-able, especially with a mountain drake since that got buffed.

Then at 14 minutes, all resistance falls off the outer turrets and all unclaimed bonus gold is removed... That is a double blow for the behind team. Now all their remaining outer turrets are weaker than they were at minute 0, and they cant get any bonus gold if they, like what usually happens when one team goes for that early snowball, have minimally damaged the enemy outer towers if at all.

If you want teams to just ff at 15 minutes then move the real ff timer to 15 minutes and the 15 to 10. Games already end sub 30 minutes anyways, and you still want to quicken the pace by making comebacks impossible. This whole push to allow the winning team a better chance to finish the game has been slowly killing any reason to continue trying to win once you fall behind.