For moderators yes. They will be educated to use the tools that the channel uses. And moderators may keep the tool open for the duration of the stream, even more so if that tool embeds the stream and chat. A “custom” third party mod view, which Twitch itself now has. See → Twitch Twitch Moderator dashboard/modview
An Example:
For viewers/users no, I wouldn’t whisper I’d use ban/timeout reasons. Since I don’t expect good deliverbility rate on whispers, especially to new people whom are new to the channel. And/or @ messages in chat.