Well, it's not like 80% of the fucking team gets a lot of gold there or anything.
ADC and support go there as their lane. That means nearly half of the fucking team is there. Even completely disregarding scalings or map layout, botlane alone automatically matters more than top or mid individually due to it being two people instead of one.
Mid roams there for kills. Jungle goes there for kills and help with drake. That's now four people influenced by botlane, instead of just two. Literally only top doesn't interact there directly.
And that's before you take into account that most ADCs are late-game champions, while most of the rest of the map is early and mid oriented, meaning they just need a kill or two before they're fine on their own.
The only time botlane will stop being a priority is when ADCs and supports start heading mid or top instead of bot, because you cannot physically make 1 person more important than 2 and have the game also be fair. Get the fuck over it. It's not happening. Your singular champion will never be worth more than two champions together.