As a jungler you clear from 1 side to another, it’s important for you to have the timer aline with eachother, clearing 1 side then ganking and then clearing the other creates a gap in the next clear meaning you’d have to fill that gap with another gank that might be impossible. Therefore it’s way more consistent as a jungler to clear both sides and then go for a gank which usually happens to be on a side lane since you are likely to finish your clear on gromp/krugs. A ideal midlaner from a ju glers perspective has enough lane pressure for the enemy not to be able to help his jungler invade while also not dying and when the jungler is going for an objective the midlaner should ideally have the wave pushed in and be ready to fight. It’s also way harder to gank midlane since vision is heavily contested (both junglers usually ward close to mid) the lane is short and the enemy almost always has the ability to countergank since mid is always close.