I’m all for privacy of individuals, but work network is not a public internet either.
A solution is required to limit the network to work related activities and also inspect server communications for unusual patterns.
In one example someone’s phone was using the work WiFi to “accidentally” stream 20 GB of Netflix a day.
What's the security risk of someone streaming Netflix?
There are better ways to ensure people are getting their work done that don't involve spying on them in the name of "security".