After playing around with the client for a bit I've found that being able to minimize the friends list would give better aesthetics since it still feels like it takes up a good portion of the client. Along with that in the profile section it seems like it can cover quite a bit of the champion that is being displayed depending on the position of the splash art in the background. I do not know if anybody else agrees with me, however those are some of the things that I've noticed since it does catch my eye a lot on the client and doesn't make it feel as smooth.
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.