Originally Posted by Powerlord
I can't say I'm surprised that this got restricted seeing as how dialogs can bypass the usual restrictions on servers changing client cvars.
They fixed that separately in the same update. It would not have been an issue if they re-enabled the dialog now.
The concerns were around social engineering when using the dialog with a textbox input. Since it's a lesser-used feature, many players haven't seen it and could be tricked into giving information they shouldn't, not knowing it's from a third-party server plugin.