Have you seen this yet, we have turned them into tankers.You never said this?
I read it in this post if I misunderstood you I apologize.
And I think nobody here disagrees with you that light brigades are mich better when it comes to fast deployments.
But you don't want to go head on with heavy units if you don't have to. Especially when it comes to the Stryker brigade. The basic Stryker does not even has enough firepower to cope with enemy IFVs. So the dismounted Javlin system is the only weapon of the brigade which is directly able to deal with the enemy mech/armored forces (Aside from artillery and airstrikes).