Sure they can afford to scrap bad boards. Damn, it's the best thing for them to do. Initially.
Fuck the cost, think of the cost of their first deliveries not being on time against that, and cancelled orders.
Get the initial couple of dozen or so units out of the door ASAP, gain the kudos for that, then relax a bit and test chips once they have that milestone achieved.
IF they get 50 perfectly working rigs in customers hands (literally since they are collected), get some good feedback... the lion's share of orders are october delivery so they'll have more time. Then they can test and not waste components.
Exactly, it would be unreasonable for them do this any other way. People seem to forget how seriously overpriced these machines are, their production cost is a fraction of a retail price. The time is the only thing they can't afford to waste. When the time comes to reduce price 50% each month to adjust to expected ROI they will start to pay attention to optimized manufacturing.