The top reply to the top comment on that thread is a caution not to get overexcited. The second is a question. The third is another caution.
Almost everyone in the top of any given subthread is approaching it very realistically.
Almost everyone in the top of any given subthread is approaching it very realistically.
Presumably he means something like total energy efficency would be very close to breakeven with modern lasers. You can tell how dubious this is from the fact no one involved in the project says anything like this. In fact, breakeven is still two orders of magnitude away and I don't believe anyone has suggested anything more optimistic.