Jaeger
That someone better
"When you attack a target that you can't see, you have disadvantage on the attack roll. This is true whether you're guessing the target's location or you're targeting a creature you can hear but not see."
"...can hear.." being the operative words here. What a PC can hear and distinguish in combat is something more than only disadvantage.
You can attack creatures outside your blindsight radius just fine (at disadvantage) unless that creature takes the Hide action and is successful.
Not "just fine" at all.
You have to either guess their location, or "hear" a target to have a location to shoot at.
5e does not define what it means to "hear" a target. Certainly not what it means to "hear" an individual target in all the noise and chaos of combat.
So common sense must rule the day.
the game defaults to you knowing (roughly) the location of all nearby creatures.
The rules say nothing that explicit. That is an assumption.
You could certainly hear them around you. (To your left, right, in front, etc...) But why would you assume the PC's can pick individuals out of a group without a perception check?
Why would you assume a free form of echolocation for all PC's races and classes?
Because that is the fundamental assumption being made.
I agree that a PC can use their hearing to try and identify an individual target - as opposed to just guessing.
But in combat you are looking at the PC using one of their actions to make a Wisdom (Perception) check to locate an individual target first.
There has to be a check made to hear/locate a target if the player does not want to guess. Especially in the noise and confusion of combat. Otherwise you just handed all your players a form of echolocation.
Assuming a form of echolocation beyond the blindsight radius is outrageously silly.
Is that really how people have been ruling things?
.