Disintegrators as Heavy Weapon Choices?

I'm looking for arguments against having disintegrator cannons available to infantry units as heavy weapon options (other than it not being in the dex right now). Make them like 20 points or so and I seen no reason not to take them.

By the same token, what arguments could be made against making heatlances and haywire blasters available to infantry outside of scourges (as special weapons)?

Disintregators would be nice to see in the hands of kabalites, but I think we should leave at least some cool weapons for scourges and reavers alone

Agreed. I'd say dissies would probably fit pretty well to kabalites, but the heatlances and haywirers are probably best if they remain in the scourges hands (and reavers jetbikes).