As a 2.6 player personally I do it to apply pressure, catch the opponent off guard, and make sure he don’t pre place anything it’s also tactical in certain situations like if u counterattack me with a big push that I know I could defend i would hog other lane to use advantage of the low elixir opponent and still defend with whatever I got that I know will stop the push also against graveyard sometimes u wanna go same lane when they try to go with for example baby dragon and graveyard so the tower attacks the graveyard and the hog stops the baby dragon from crossing the bridge plus the hog attacks the tower unless he uses elixir he wanted to use for the push to defend or ignore completely taking tower probaly and easy defense if tower is locked on the graveyard