That article describes what the agencies here have mostly done here in JoCo KS nearly a decade ago.
For one, interoperability. This is a big plus by doing this for PSAP's/officers not on the same system/setup for said radio comms.
Second, it keeps general dispatch open to the public, simply so that people know what's going on. Basic public trust is what that comes down to.
Three, leave the tac, and other private communication talkgroups/channels encrypted. If it's a special operation, or sensitive info being communicated, leave it in the dark. Public doesn't need to know what is going on at X or Y down to a tee. As that sort of stuff can sometimes compromise officer/a person's safety.
All in all, I do applaud Chief Doering for making the decision to open the air on their main dispatch channel.