I don't agree at all, duality is something we lack in this codex. We tend to have units that do anti armor or infantry but usually not both.
If u are only running one, and 2 ravagers then by all means use disies. But if like me unare running a mostly gladiator armY with 2 razorwings and a voidraven thats alot of lances to make up. And at the cOst of those 3 units, there won't be much room left for more lances.
I have found that the missiles and lances work well together , if there is infantry on the board I'll take the missleshots, 2 lance shots and a splinter cannon=dead pretty much anything. And after the missiles are gone u still have some way to help out your tank popping.
I just don't see the point in disies anywhere. We have weight of fire from so many units that making some termies fail enuf to become no threat is VERY easy. Those lances on the other hand are hard to replace.