I’ve heard many people saying that the front-end looks old and needs more work, but I’ve never heard someone describe how it could look better. To me, it looks perfectly fine. I wish it had a card layout similar to libreddit, but aside from that, I think it’s nice. If people want a completely different look, then there’s lemmyBB, and there will probably be other front-ends in the future. However, we should hear opinions about which styles people want.
It is a mixed bag. When reading excessively long lines of text, it becomes difficult to locate the next line after completing one. Allowing lines of text to become too long is considered poor typography for this reason. When the lines are constrained to a reasonable length, the text becomes easier to read. Think about a page from a novel, or a sheet of A4 paper. They are shaped like that for a reason. Of course, images and video are another story. Constraining the size of an image or video with such wide margins does nothing to aid visibility.