FF @ 20
You might as well EVERY SINGLE GAME, since there is Zero chance at ever coming back anymore in one. Everything snowballs, get lead? Well now you 2k gold instantly ahead of the enemy. GOLD GOLD GOLD GOLD GOLD, GOld everywhere, gold for the team, gold from rift herald, gold everywhere!
It seems the entire goal of pre-season is to make every match last less then 25 minutes, because you got zero chance at coming back even if you tried, due the insane amounts of gold the enemy can accumulate now, and the adc buffs being MASSIVE, everything they build is insanely cost efficient. Letting them snowball even more.
I honestly like a 40-50 minute games, they give you a chance, a challenge, a reason to keep going, and when you finally beat the enemy team in the last team fight for last push for the win. Now it's just meh, I got double kill early, GG already.