TL;DR
Each inserter has a slighty different shape and look behavior (as well as a different color). The faster, the bigger the base. With fancy effects.What ?
While you are at upgrading graphics in HD, you could improve the look of the inserters. I'm not talking about gameplay. "bigger" only means that it looks bigger, not that it takes more space on the map.Each inserter type should have it's own form, based on its capabilities. But they should all look coming from the same collection.
- the burner inserter should have a kind of mini furnace, one the side, that would emit light and smoke when moving (like the game furnaces)
- no extra modification (regarding this suggestion) for the yellow inserter
- the long handed inserter should have its base a little bigger since it is faster
- the fast inster should have a big base since it is fast
- the filter inserter should have a kind of detector (such as a mini camera) on its arm to detect what it takes (and the same base as the fast one)
- the stack inserter should have the same base as the fast inserter (keeping its doubled arm)
- the stack filter inserted should have a big base, a camera and a doubled arm
- electric inserters could emit some kind of small lightning light in their base (containing their engine) when moving (like the one when you plug an electrical plug in its socket). But as others devices don't have this behavior, I'm not sure...
When resting (because of brownout, no proper electric network or because logic signal is False, but not when only waiting for something), inserters should recall their arm with the same animation (but reversed) as the one when you connect them on the electric network for the first time.
Why ?
Beside the fact that it would improve the graphical richness of the game, it would allow color blind people to more easily distinguish between inserters. It's not a miracle solution, but once you noticed the details, it will be much easier to see them.For the burner inserter, since it consumes burnable materials, emiting smoke would remind us that they polute (or they should...).
For the arm deployment animation, I feel it's too bad that we see it only one time. It could be reused in some case like when something else deactivate the inserter.