Better Bot Wins
Literally 80%+ of my games right now are decided by the better botlane. People cried ADC2k17 lul because for once ADCs weren't an absolute existence in League, so Riot went around buffing shit so now Crit ADCs are back in action. Top it off with Supports being ridiculously impactful rn with their great new itemisation - Ardent Censor, Knights Vow, Redemption to name a few, and you have a situation where the better bot is the role that almost always wins. Honestly the only time I've seen another role outcarry a botlane recently is if they had a DPS/SelfPeeling/Hard Carry/Burster - Aka Yi or Fiora, or if Both Bots were just thoroughly underwhelming and didn't do much.
The worst part about it is that, unlike Top or Mid, Bot lane is literally one of the most difficult lanes to influence. Bot is by far the most counter-snowbally lane, therefore so long as the Better Bot doesn't tilt, they can come back even if you camp them. Not to mention how some Junglers just straight up cannot camp certain botlane compositions unless they get really lucky.