I bought my 6D with the 24-70 kit lens in Feb. here in Canada and I don't regret it. The macro is so quick and easy to use and is great for a holiday person who likes to get shots of small things and I love the lens. F4 is fine with the high ISO of the 6D. The macro mode is a gimmick just like WiFi.
I have a DSLR for about 5 years, and have never bought a macro lens, because it doesn't interest me. I do like having more focal length on my kit lens.