Anyway, for most users do you really need that performance increase clipless gives over toeclips?
"Need", or "like"? Do I need an expensive recumbent tourer? No, but I still have one, because I like it! But these aren't for "most users" in any case: see below...
If you want a pedal that can be used with clipless cleated shoes but you still want to use normal shoes at times then why not just get ones that have flat pedals one side and cleats the other?
That was my first reaction, but then I read it more closely and saw that I'd missed the point. The point being these are for in an environment where you want some of the benefits of clipping in without having the baggage space to take an extra pair of shoes. As above, this is not "most users", but it is "some users".
Pete.