This is why B00nie is getting frustrated.You are too hung up on payload delivery, it's not needed anymore. What are you using this device for? What is the device it communicates with? Where does that traffic end up? What other devices are associated with that device? One device gets compromised on the network, the entire network is compromised. I don't need a RAT (or other remote) on the target anymore, I am searching for data, silently. If I get some credentials, that's great, but that's not all there is to "hacking". Again, I don't need a payload on a device to make use of it, nore do I need remote access, even though eventually that's what will end up happening. As long as there is unencrypted data, or common encrypted data (VPN) coming from that node, it will fall eventually.
You cannot send data over a port if there is nothing listening for data on the other side of the port, and even then we're talking fairly specific data. You cannot just force data through an open port.
Browsers can be hacked as they are listening via an open port for specific traffic. If anything is going to be compromised via an open port, that's the most logical target.