The word sleek is unrelated to size, it refers to having an elegant, streamlined shape of design. Removing the 3.5mm jack does allow for a more sleek design.
This is what I'm talking about. I don't really use my phone to play music that much (although it is definitely a non-zero amount). The dealbreaker for me is that they've made a device that doesn't lay flat without a case. Although, since it has that ugly bump on the back, it's not like I'd want to have the phone outside a case anyway.
Actually, it's not really about appearances for me. It's just that it wouldn't sit flat. Like a table with 1 leg that's an inch longer than the others at a shitty diner.
Apple permanently lost their "sleek" cred when they introduced the camera bump on iPhone 6. No way in hell Steve Jobs would have released that monstrosity.
It's the exact same size as the 6s.