Why exactly do peolpe say Marauders scale better with gear?

[Korevas]

As the topic, because I think that this sentiment got carried over from wow, where melees tended to scale better with gear because weapon damage was factored in their attacks, while casters didn't get something to make up for that. Here though it seems that weapon damage and force/tech damage both come on every weapon so its not like we gain more of an advantage with better equipment.

Also, off hand attacks are horrible. When I first read the descriptions of the skills using 2 weapons, I assumed that a dual wielder using them would do much more damage then a single saber attack. Now it seems the bonus damage actually is a percentage of your off hand base weapon damage, not modified by strength/stats at all which means it does basically not scale with anything except your off hand weapon slot :/