There seems to be a problem increasingly creeping into the gaming industry of longer and longer term pre-sales (pre-orders, pledges, backers, season-passes etc.) - the problem is: the longer the time between purchase and realisation, the more scope for the product delivered to differ dramatically from what was originally promised; even with the best of intentions from the developer.
You can say that's inevitable, there's an asterisk and a clause warning you this could happen; fair enough. But the more things change, the more pointless these early sales are. The developer could remove the one feature the buyer wanted when they purchased, and these pledges aren't cheap!
Caveat emptor, fair enough. But surely it has to have limits. You can't just offer a Ferrari and deliver a Lada*, and wave your hands and point to the small-print that covers you. It's not unique to SC at all, though I think the scale of the game, the length of its development cycle and the scope of its ambition make it particularly vulnerable to such over-promises and under-deliveries. (If ED is any different, it's because it's launched and has a forum full of us biting FD's ears off and a bug-forum bursting to the seams, which is tempering its ambition).
I really think a specific pledge should be set in stone. If feature/stats aren't certain, don't use them to sell a pledge/package. If you want to mention uncertain features, fine. But CLEARLY mark them as such. Say "This may be a 1 or 2 seater craft", not "This is a two seater craft*" Don't rely on small print and asterisks.
(* yes, I am deliberately being a little hyperbolic for effect...)