We are all talking about the Olympics here, its actually the thread topic...
if we don't take the competitive team weight into account when considering a suitable boat for the games then we could end up with a situation that develops teams on the extreme end of the weight scale. That isn't good for the sport at all. Nobody wants to see emaciated teams sailing on a hobie 14 turbo, nor do we want to see 2 fat dudes try to sail an Extreme 40 (that could be funny though..)
And if you can state that your F16 is only affected by 1-2 seconds with a 60kg weight difference is just silly. We know from a lot of straight line testing and crew swapping (with top level teams) that weight does make a difference to boat speed. And that is with a whole lot less difference than 60kgs between teams!