You have to consider that they weren't "telepathic" in the sense that they had ESP.
There was a flaw in their implants that allowed them to transmit thoughts electronically. Because the implants were never intended for this purpose they probably didn't have proper antennas or shielding, so they could have been highly susceptible to interference from numerous sources. This would explain why they also spoke to each other. A lot. Even without interference we don't know what the transmission rate was. If you have a crappy cell phone signal it can take a couple of minutes for a simple text message to get sent, and that's with equipment that is specifically designed to do exactly that. Try texting a quick "LOL" at a large event and chances are excellent that it never goes through.
In the movie, Ava is also hacking the complex's security systems with her transceiver, while all the implanted soldiers are probably all "yelling" stuff at each other on their transceivers. Think of all the marines in Aliens hollering into their mikes when the aliens attacked, and Lt. Gorman trying to give them instructions. Nobody could hear him. I imagine that if he were there with the marines and he had two that hadn't lost their s#!t, he would just have given them hand signals rather than try to get heard through all the chatter.
Most people can say, "Stop!" or, "Go!" faster than it takes to take their hand off their weapon, raise it up, and give a signal, but if you can't hear it because a dozen other voices are all yelling in your ear, it wouldn't matter how fast it was said.
Even if it is ESP, and virtually instantaneous, if everyone's ESPing each other to Stop! Go! Duck! Jump! Delete my browser history! Look out behind you! then it's going to be a lot more reliable for Ava to just give direct hand signals to the guys she's actually with.
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