No, I wouldn't say that's a problem. I use the 430EXII with my 7D and I'm happy with it. I didn't even know about this limitation, but on the other hand I mostly use the center AF point - especially in dim light where the AF assist beam is used. I haven't done any testing, but I suppose the AF assist beam may not cover the outer AF points of the 7D. I wouldn't bother too much about it though.