Crossbows in Greece and Rome

How would it affect both groups if the crossbow imported from China had made it into the Greek and Roman armies' hands? I know Rome had their own version as siege weapons, but what about one for an auxiliary to carry.
 
The Greeks did have their own pseudo-crossbow, the gastraphetes:

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Arrian also hints at Roman cavalrymen firing handheld crossbow esque weapons, as does Vegetius, so it seems the Romans had some form of handheld crossbow like this manuballista:

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So now all we need is to find a way to make them more widespread and used in the Roman and Greek world. Does anyone know why they weren't?
 
Torsion manuballistae are finicky weapons. You can use them to good effect, but they hog maintenance time and require exotic supplies. There is evidence for more conventional crossbows in Roman times, and I suspect they were not widely used because they didn't find a military niche. Highly trained soldiers (like the palatine troops or royal retainers) could spend the time and effort to learn shooting the bow or using the sling. Poorly trained troops might lack the support system necessary to produce and maintain something as complex as a crossbow. And there were no urban militias in Rome.
 
The point of a crossbow is that you don't need much training. It's very simple to load and shoot compared to the proper English war bow. I myself own a 200lb plus crossbow that has a goats foot lever to shoot and also 2 longbows one at 40lb draw and the other at 80lb which is at the lower point of what most war bows would have been. My point is that I figured out how to shoot the crossbow in a matter of minutes, yet still can't quite manage my heavier bow.

However on to why they didn't bother with them when being so simple to use it seems so obvious to us...The crossbow is best used in defensive and siege situations, now with those situations on mind the Romans already had numerous ballista and onagers so why would they have even wanted to have bothered? After all it's more for your logistics to worry about. Plus the Romans already had other weapons proving the same service on the battlefield covered by the crossbow such as darts and slingshots (ask members of Brittannia about their use of recreated slingshots and how effective they are) . Oh and another thing the use of a crossbow requires open order troops not close order a la legion.
 
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