It is really annoying typing in the new client and not being able to see what things people just said. When you are in the middle of typing the chat will stay in place and you cannot read whatever is being recently said.
This board is the best place to discuss the client with Rioters and your fellow players, although it won't be our main source for feedback resolution. Look to the other tools, like the Submit Feedback button in the client, for that. As always, please follow the Universal Rules and keep content focused on appropriate topics for this board.