The analogy between amph/hover and spider is not
nearly as good as many people seem to think it is.
- The advantage of amph/hover in fighting from small bodies of water is much more dubious than the advantage spider gets when it fights from a hill. At worst, a few Urchins nullifies any advantage Amph gets from being able to submerge in puddles, and you can just shoot at any Hover units on a puddle. A Crabe on a mountain, on the other hand, is nearly impossible to dislodge without a lot of expense.
- Amph is in fact not as good as bot factories on pure land maps (and is certainly much less flexible). Hover is similarly less flexible and generally has more fragile strategies when compared to lveh.
- Hills that are relevant to spider are
much more common than puddles that are relevant to hover/amph.
Also, Spider is playable on a wide range of maps; there are degrees to hilliness. I don't understand why anybody would even want Spider to be good on Comet maps or what have you.