Teams clients can use quoted replies in group, 1:1, and meeting chats. A quoted reply is where Teams inserts a snippet from a previous message to create a new message. It’s a tremendously useful feature which allows users to add context to something discussed in a chat. (quoted replies are not supported in channel conversations). The only question is why it’s taken Microsoft so long to add this feature to Teams?
You can disable Chat for Teams users, but is this a good idea? Chat is an integral part of Teams and disabling it seems like a bad idea for many reasons, not least being compliance as all you’ll do is drive users to find another way to communicate – like WhatsApp.