TL;DR
Let us add a new catergory of belts as to get over those pesky cliffs. Also, bridges!What ?
So you have 3 tiers of these elevated belts, as per usual.You can place and rotate it just like normal belts, but they can be used to move cargo up.
They also require power, unlike belts, as it requires energy to move the items up.
The more items on the belt and the higher tier, more power is required.
As a side note, you could also make bridges to get objects over structures.
These, however, would cost more than umnderground belts, therefore making the latter a more preferable option.
Why ?
It would add a new dimention to game play, quite literally.Many players have made complaints about cliffs, so why not make them less of an issue.
You also wouldn't need the spidertron, as you could just go down on the belts.
