Why can we listen to enemy radio chatter?

Sorry if it's a dumb question, but I found no answers online. I get we can hear the enemy pilot bosses, since they are acrively trying to taunt us, and must be using an open channel, but why can we hear things like soldier chatter and Federation command talking to it's troops?

No character other than Monarch (even Prez, for that matter) seems to hear it, since sometimes even thought the Federation is clearly giving out what they are doing the rest of Sicario/Cascadian forces are oblivious to it, so I assume it's a gameplay thing, and it's just so you can get an idea of how both sides are reacting? Again, sorry if it's an obvious thing, it's just I can't get my head around it.