How to use LT w/ Combi-weapon?

I don't understand how to run the lt with combi weapon. Anyone have a good YouTube example on how to play him or personal 11th edition experience running him?

I feel like he cant contest the expansion or center objective if they have any units on it.

He can get to my expansion objective without having to advance which is nice but I feel like that's all he's good for

So he can do an action turn 1 then he's very easy to kill after that.

Wouldn't a solo captain in gravis armor with the armor enhancement be better? Sure he takes 1 turn longer to get to the center but once he gets there he's impossible to move unless the enemy commits a lot.