I have a game bot that I run just on my stream to keep chat kinda clean I allow users to whisper the bot. Found out yesterday whispers no longer work through strait IRC commands so now have to write a bunch of new code for whispers in my bot despite them working just fine for the last 6 years.
I’m fully expecting that one day the entire chat system on twitch will no longer use irc. They have very clearly been extremely slowly working there way towards that. Instead of using a well documented and easily accessible system they’d rather make you jump through hoops to communicate with your users.