I feel like it'd be a super beneficial buff to him so he can be a little creative if he needs to engage, that said though, i'm sure that there's a reason they made his dash like it is and didn't change it that i'm just not thinking of. 
I assume it's because he's too fat.
Riot is size shaming obviously. They think urgot is too fat. But urgot proves big is beautiful.
It's actually a mechanical issue, if you think about it. His dash grabs the first champion he collides with and immediately puts them on his other side. If he vaults over a wall and snags a champion immediately on the other side, there now comes an issue where "his other side" is now exactly adjacent to a wall, making it an awkward, invalid space to deposit a champion. I imagine that this interaction could lead to bugs and awkward placement issues that would have bogged him down.
They didn't want to give strong mobility or an strong escape to a juggernaut
That would give him an unprecedented amount of mobility for a juggernaut.
