Radio Reference has been successful without a chat room. Forum's provide plenty of communications amongst members. Some may have created radio related Discord channels. There are a few IRC channels on Freenode and other IRC networks. I don't think Radio Reference want's to have to 'police' another feature. They have enough on their plate with maintaining the forums, their web site, the database, and Broadcastify. That seems to be a very huge responsibility.
I certainly wouldn't add a chat room because of the current level of responsibility is great enough if it was me. Put yourself in their shoes while you think about making requests. If your asking this for your own pleasure without seeing their side of things then perhaps you should think about it more.
Here is a good chat room for all radio
Radio Hobbyists Discord Channel
Discord is the easiest way to communicate over voice, video, and text. Chat, hang out, and stay close with your friends and communities.
discord.gg
Have fun