Wow… I can just about understand why people would think 2 similiar bikes rode much the same, though I’d disagree. But a Five and a Superlight? Crazy talk frankly.
As far as most people on the planet are concerned there are things that are bikes and things that aren’t. The number of people who would accept that you need a different bike for road and offroad riding is already quite small. The number that care about the difference between a Five and a Superlight? Well, they are probably all on this forum.
I’d agree that people who love riding bikes can feel the difference between different bikes. But even then I’m not sure it matters. As long as the bike is half way capable then my enjoyment depends a lot more on the trail, the conditions and on how I’m feeling than any subtle differences in the way the bike handles.
That doesn’t mean that all bikes are equally good but it does mean that other factors (such as who made it, where and how etc) are just as important (to me at least) as tiny differences in how it feels. Especially since they are almost always compromises i.e. bike X is better than bike Y at doing A, but is not as good at doing B.
Cheers,
Andy