Well, how else would a ground assault look like? Walkers have been established as an effective force, if they came up with somehting new, people would ask “where are the walkers?”. Also, trenches are a very common defense against ground attacks and if there wasn’t a rebel base, what else would be the target of a ground attack? And the planet is nothing like Hoth.

I also must have missed the scene in Empire, where the Empire blasts a huge door away, or the TIE fighters joinging the ground attack or where Han flies directly at the enemy force to sacrifize himself, or Luke facing Vader to buy his friends some time.