Should every zigbee device be linked to a repeater?

I have 80+ devices with 2MQTT.

I connected as many as possible to a repeater to not stress the coordinator too much.

Should I am to connect all the battery devices to a repeater?

I still have 7 connected directly to the coordinator but they are very close to it (like max 3 meters).

I could still connect them to a nearby repeater but I wonder if there is a added value to that.

Thanks :)