I really don’t understand why they disable the NULL cipher. If I want to take the risk and transfer data cleartext over my LAN I don’t see why I need to custom

I really don’t understand why they disable the NULL cipher. If I want to take the risk and transfer data cleartext over my LAN I don’t see why I need to custom compile ssh/scp to do so (and miss out on security updates since its no longer a tracked package). I still want my auth credentials encrypted so no telnet and other older tools are not a replacement.