Same here. This sounds far worse than just the normal typing notification. If I was using an application that did this preview, I would type up messages in a text editor and paste them in. There's so many times where I have a massive block of text that I'm not satisfied with as communicating my thoughts properly and I don't want to expand it out to an essay (no one will read that in a chat application), so I just delete it and replace it with an acknowledgement of the message I'm responding to. That would look ridiculous to other people in the chat!
For what it's worth, it sounds like a pretty useful signal to others in the chat to know you have a lot to say on the matter, but have actively chosen to say little. The ledger would show a simple message, but ephemerally you and your colleagues would have gotten to know each other slightly more than the otherwise dead-air.
I also had a limit over 52 chars with elipses to stop walls of text.
