If that is a security problem, you probably have a much bigger problem anyway. Secure passwords cannot be cracked, the public internet is hostile anyway and you

If that is a security problem, you probably have a much bigger problem anyway. Secure passwords cannot be cracked, the public internet is hostile anyway and you should be protecting your communication with strong cryptography. Pretty much the only sensible reason why you should protect your internal network from access (including sniffing) is because you might have IoT on it that tend to have terrible security. Putting them all in the same, but separate, network, essentially achieves nothing.