system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why are droids not programmed to fire simultaneously against Jedi?

Is it not impossible to block 3 shots arriving at the same time?
If you want to include dodging, 4 sets of 3 shots arriving at the same time.
gpt
I work for a small droid manufacturing concern, and, yes, we make a few lines of battle droids.

Believe it or not, this was the first question to be asked at the design meeting for our new base model unit for sale to the Imperial government. It would be useful not only for rogue Jedi scum, but also for overloading personal shields and overcoming armor plate with only blasters.

The key problems we encountered were:

1) The control signal to synchronize the droids was far too easy to use as a tracking signal to locate and avoid security droid patrols.

2) The control signal could be too easily interrupted, preventing the droids from firing at all.  For example, if the signal generator is remote to the units in question, then shutting down the generator would effectively disable that entire force. If one droid in a unit were equipped with the signal generator, then losing that commander would shut down the entire unit. This was not acceptable to our customers who remember what happened on Naboo some years ago.

3) Cost. Synchronizing transmitters and receivers not only add to the hardware costs of the droids, but also to maintenance costs over the service life of any contract. 

In summary, while there are a limited number of uses for this type of feature, it introduces a flaw in to the design of security droids that also drives the prices to unacceptable levels.