The biggest omission of the game?

[Hento]

I was thinking something like a smaller version of Driller as a lvl5 mechanical unit.
Also there is some unreasonable stuff like telescopic sight not giving boost to Repair Droids.

Actually, there are many instances in the game when you expect some upgraded or different mechanical units, especially that time in Tekron when one dwarf was talking about droids with lasers(Evil Beholder's ray looks excellent).