What is the use case for using TLS on an internal network?

If there are admin consoles on the internal network and TLS has been disabled what is the use case for enabling it?

The only use case i can think of is if you have untrusted users on the network who could potentially use pack sniffers to sniff the traffic.

Enabling TLS would mean monitoring devices would not able to monitor the traffic as it will be encrypted.

What are your thoughts? Should TLS be enabled for users accessing services (e.g. admin consoles) on internal networks?