You are overblowing it. It takes maybe 30 seconds more time, if that. It is a non-issue. I don't even have an IGH bike anymore, so it's not like I am an IGH evangelist, but it is misleading to say it is some kind of big hassle to change a flat on an IGH bike as opposed to a derailleur bike. In some ways, I find it easier. I often have to take the skewer out to get the wheel past the rear derailleur on my other bikes, which is annoying, and I sometimes have to push the RD out of the way as well, which gets me greasy. This is not a big deal, but I'm saying this hassle is no worse or better than changing the flat with an IGH bike. They both have little hassles--none of which are major.