The hub allows you to use a wider range of devices with your SmartThings account. This would include Zigbee devices and matter devices. (Other models of SmartThings hubs also allow you to use Zwave devices, but the station doesn’t support Zwave.)
So the station is very helpful if you want to bring third party devices that use matter Into your SmartThings account, But if you are only using devices that connect directly to the SmartThings cloud, the hub doesn’t give you anything extra. 
FAQ: What do I need to add a Matter device to the SmartThings app? Do I need a bridge router device?