Does the height of an input field affect UX?

Overview

I'm working on a project that includes an in-browser Chat feature. We're looking for ways to improve the UX.

Problem

Today, our online chat UI offers a textareathat allows customers to type an average of 400 characters into a message. This results in extremely long messages where the users thought often gets lost.

Question

In doing some research, it's been suggested that a limited input area might encourage more users to complete their thought in fewer words. This results in clearer messages and quicker responses.

Is there any evidence that shows that simply making an input field shorter/smaller encourages users to complete their thoughts more efficiently?